Tag Archives: mercaptans

What’s fine (and not so fine) about Vegan Wines

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Veganism is described as one of the fastest growing lifestyle movements in the world. Some estimates claim that in the United states alone, there was a 500% increase between 2014 and 2017 in the number of Americans (around 19 million) identifying as vegan.

For the wine industry, that is a sizable demographic that retailers and wineries have value in marketing to.

So what makes a wine “vegan-friendly”?

For the most part, veganism is a code of conduct that avoids using any animal products or by products as well as anything that has been tested on animals. There are various reasons why people adopt veganism but often ethical concerns about the treatment of animals and impact on the environment are cited.

While wine is often assumed to be vegan, the use of animal-based fining agents such as casein (milk protein), albumin (egg whites), isinglass (fish bladders) and gelatin (animal collagen) in winemaking is problematic for many vegans.

Let’s Talk About Fining Agents

As Alison Crowe notes in The Wine Maker’s Answer Book, fining agents are used to help clarify and stabilize wine by binding to molecules such as proteins and excess tannins. These are items that can cause unsightly haze in the bottle, aggressive bitterness on the palate, off odors and flavors. The agent binds to the target molecule to form larger structures that eventually precipitates and settles to the bottom of tank or barrel as sediment.

Bruce W. Zoecklein et. al in Wine Analysis and Production classified the various fining agents into 8 categories based on their nature.

Photo by self. Uploaded as User:Agne27 to Wikimedia Commons under CC-BY-SA-3.0

Isinglass and bentonite fining trials.

1.) Earths like bentonite and kaolin
2.) Proteins like the animal based ones above
3.) Polysaccharides like gum arabic and Sparkolloid
4.) Carbons like activated carbon
5.) Synthetic polymers like polyvinylpolypyrrolidone (or PVPP)
6.) Silica gels like silicon dioxide or Kieselsol
7.) Tannins often derived from insect galls on oak leaves though oak chip fining can also fall into this category.
8.) Others which includes both enzymatic fining (more fining aids rather than fining agents) and chelators that assist in the removal of metals such as “blue fining” with potassium ferrocyanide (illegal to use in the United States).

The different fining agents work on principles of electrical charge (like positively charged gelatin reacting with negatively charged tannins), bond formation (like the carbonyl group of PVPP bonding with the hydroxyl group of tannins) and by absorption/adsorption (like activated carbon absorbing off odors or bentonite adsorbing proteins).

There are positive and negative attributes to each fining agent with no one fining agent being perfect for every situation.

Animal-based Fining Agents

Egg whites (Albumin)

Used primarily to remove excess tannins. Works by forming hydrogen bonds with the hydroxyl groups of tannins. Compared to other fining agents like gelatin, albumin tends to remove less positive flavor and aroma traits. Egg whites have a long history of use in winemaking in places like Bordeaux and Burgundy. The usual addition is 1 to 3 egg whites per 225L (59 gallon) barrel.

Casein (Milk protein)

Used primarily to remove browning or pink color in white wine. Can also be used to remove some off odors. Works by adsorption and attracting negatively charged particles. Like with egg whites, it has a long history of use in wine production, particularly with the great white wines of Burgundy. It also has the benefit of reducing the concentration of iron and copper in wine. In red wines, it can negatively impact the wine by removing the polyphenol resveratrol that has been associated with various health benefits.

Gelatin (derived from the boiling of animal tissues like bones and tendons)

Used primarily to remove excess tannins. It has a positive charge that reacts to the negative charge of harsh tannins. It can be prone to over-fining that can strip a wine of positive flavors and aromas.

A heat stability trial for rose wines that have been fined with isinglass.

Isinglass (derived from the air bladder of fish like sturgeons)

Used primarily to help clarifying wines, remove excess tannins and to “unmask” or bring out varietal character.

Chitosan (derived from chitin in the exoskeleton of crustaceans)

Used primarily to remove haze causing proteins from white wines. A positively charged agent, it often needs to be paired with a negatively charged fining agent like Kieselsol to be most effective.

Blood Albumen (derived from the blood of ox and cattle)

Historically used but illegal in the United states, France and several other countries.

Vegan-friendly Alternatives

The website Barnivore is a database of wines and other liquors that have been vetted by users to be either “vegan-friendly” or not. In answering queries about their use of animal based fining agents, many wineries share their alternative methods.

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Letting the wine settle and clarify on its own before racking into another container is one method to avoid using fining agents.

One common method is the use of time and gravity to let the wine settle and clear out on its own. This is the technique used by Baldacci in the Stags Leap District and many other wineries. Depending on several factors like the health of the grapes, method of pressing, pH and temperature, this method could take several months and even then the wine might not be completely stable. Some wineries facilitate this method with the use of mechanical centrifuges and ultra-filtration but these carry the risk of being overly aggressive and potentially stripping the wine of positive flavor and aroma attributes.

Along those lines, many wineries adopt a hands-off method of not fining or filtering their wines at all. This is the method used by many high-end wine producers like Black Cordon and Kapcsandy in Napa Valley. This does carry the risk of haze and sediment developing in the bottle. However, the risk is often presented to consumers as a trade-off for having potentially more complex and flavorful wines.

Bentonite and Yeast Fining
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The lees sediment and volume loss from bentonite can be significant (between 5-10%). Using counter-fining agents like isinglass can help with lees compaction but would obviously make the wine not vegan-friendly.

The most used “vegan-friendly” fining agent is bentonite. This is a type of clay that can dramatically swell in size to adsorb protein molecules. This is the method used by wineries like Chinook in Washington State, Ideology in Napa Valley, Spier in South Africa and many others. One big drawback is that it causes significant loss of wine volume due to the heavy sediment it creates. As much as 5-10% of volume could be lost. Roger B. Boulton et al notes in Principles and Practices of Winemaking that these voluminous bentonite lees also create a large amount of solid waste that can have an environmental impact (such as sealing percolation ponds) if not properly disposed. In red wine, there is also a risk of color loss.

Some wineries like Amici use the technique of “yeast fining” for wines like their 2013 Russian River Pinot noir. This involves adding fresh yeast to a wine.  The cell walls of the yeast contain about 30% positively charged proteins. These can then adsorb many polyphenols and compounds which cause off odors. It brings the risk of the yeast breaking down as lees, releasing sulfur compounds and enhancing reductive notes. Also, if not removed by filtration, the yeast in the bottle can start re-fermenting any residual sugars. This would cause spritziness in what is, otherwise, supposed to be a non-sparkling wine.

PVPP and Other Methods

PVPP is a synthetic polymer that can remove bitter tannins and brown discoloration from white wines. Like casein, it can remove the polyphenol resveratrol from red wines. There is also a risk of overfining. This is because the PVPP also binds to desirable tannins and anthocyanins needed for structure and color.

Sparkalloid is a blend of polysaccharides and diatomaceous earth (fossilized algae) that can be used to clarify white wines. It does take significant time to eventually settle. This also creates a fair amount of waste with the DE that requires proper disposal.

Activated Carbon can be used to remove off-odors such as mercaptans (rotten eggs, burnt match). It does have the risk of overly oxidizing wine as well as stripping color and resveratrol from red wines.

New Developments on the Horizon

Ronald S. Jackson notes in Wine Science that fears about the prions potentially in gelatin and “Mad Cow” disease, encouraged studies into the use of plant proteins like wheat gluten as a substitute for gelatin. (Note: most gelatin used in US winemaking is derived from pigs rather than cows) Likewise, a New Jersey company has been experimenting with using pea proteins in conjunction with bentonite and silica as an alternative to gelatin.

Interest in food allergies have also spurned innovations with Scott Labs developing a technique to isolated chitosan from the fungus Aspergillus niger (instead of shellfish and crustaceans) that can be used as a fining agent.

The California based ATP Group has developed a way to extract tannin powder for fining from white wine grapes instead of insect galls to help soften tannins.

In 2016, a Swiss company announced that they were experimenting with the use of UV light to soften tannins in lieu of using animal-based protein fining agents.

The Biodynamic Quandary

Are wines produced from fruit sourced from biodynamic vineyards truly “vegan-friendly”? Several of the “preparations” used in biodynamic viticulture require the use of animal products such as cow horns (BD 500 and 501), stomachs, intestines and bladders.

In an anecdotal account of a visit with the vineyard manager of the biodynamic Pinot noir producer Sea Smoke, Kirsten Georgi (The Armchair Sommelier), describes how the “Biodynamic approach” to removing gophers without the use of poisons or chemicals involves trapping several gophers, killing them, burning their ashes and spreading those ashes over the vineyard during winter solstice as a means to “scare off” the rest of the gophers. This method of “peppering” vineyards with the ashes of pests is not unique to Sea Smoke with recipes on biodynamic websites recommending its use for everything from weeds, snails and insects to mice, rats, rabbits and opossum.

PETA Approved?
Photo by Mark Smith. Uploaded to Wikimedia Commons under CC-BY-2.0

Manure composting at a biodynamic vineyard in Tasmania.

Despite these practices, organizations like PETA recommend biodynamic wineries as “vegan friendly”. The UK website Vegan Wines Online notes that while “…natural animal products can however be used in the growing process all the biodynamic wines they sell are somehow suitable for vegans.

Even organic viticulture could be problematic with the use of animal-derived bone and blood meal being used in lieu of chemical fertilizers. There is even debate if manure, as an animal by-product, is acceptable. Like honey and milk, manure doesn’t require killing the animal but still often requires farming to acquire.

What about the presence of insects in healthy and vibrant organic vineyards? Does that makes a wine less “Vegan-friendly”? Eschewing the use of chemicals often means more insects as MOG (material other than grapes). Absent expensive sorting these bugs can get caught up in the harvest. On the Barnivore website, Calcareous Vineyard in Paso Robles expressed this reservation though their wines were still classified as “vegan friendly”.

More Manipulated=More Vegan-friendly?

Are the most “vegan-friendly” vineyards the ones being farmed with heavy saturation of pesticides and chemical fertilizers? It seems like it when you compare it to organic and biodynamic vineyards with high insect MOG and animal-derived fertilizers.

Mass produced wines like the PETA recommended Sutter Home and Moët & Chandon often employ these conventional, chemical dependent styles of viticulture.

While avoiding using animal-based fining agents to remove excess tannins and haze forming proteins, big mega-corps can use other tricks to manipulate the wine with things like lab designed enzymes, oak adjuncts and Mega Purple which will “smooth out” bitter tannins and cover up off-flavors.

Just a single drop of Mega Purple had this white Riesling looking and smelling like a Grenache rose. Crazy stuff.

Sure, Charles Shaw reds (Two Buck Chuck), Sutter Home Cabernet Sauvignon, Meiomi Pinot noir and Yellow Tail reds are made without animal fining agents but should vegans (and really all wine drinkers) be concerned with what other products are being used to make these wines?

And while it can be exciting to see advances in the use of pea proteins and fining agents derived from fungi like Aspergillus niger, its worth asking if these are only adding to the laundry list of the 60+ (and counting) additives that can be used in winemaking–taking it even further away from being just “fermented grapes”?

Now What?

While I’m not vegan myself, I wholeheartedly support anyone that chooses to live their life by convictions. I respect their ethical concerns for the treatment of animals.  I also share their concerns about the environment animal products have. It’s not my wish to stress-out vegans who just want to relax and enjoy a nice bottle of wine.

I do believe it is fair to think about the big picture involved in many seemingly “vegan-friendly” wineries.  Often the viticulture and winemaking practices they use may not align with the ideals of many vegans.

However, it is clear from sites like Barnivore that there are tons of environmentally conscious wineries (many of which are even owned by vegans) that are producing vegan-friendly wines. They may not be the easiest to find at grocery stores or restaurant wine lists that can be dominated by the portfolios of the large mega-corps but these often small family-owned wineries are well worth seeking out and supporting.

And that’s something that I think both vegans and non-vegans can drink to.

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Walla Walla Musings

A few notes from the Walla Walla Valley Wine Alliance tasting featuring 40 different Walla Walla wineries at Seattle’s McCaw Hall.

New (to me) Walla Walla Wineries that Impressed

With over 900 wineries, even the most avid Washington wine lover has a hard time trying to taste them all. Walla Walla, alone, is home to around 120 wineries so even this tasting provided only a slice of what the AVA has to offer. My strategy at events like this is to hit several new wineries that I’ve never tasted before revisiting old favorites.

Lagana Cellars— Poured 2 whites (Sauvignon blanc and Chardonnay) and 2 reds (Syrah and Cabernet Franc) and while all 4 were solid, the reds were definitely a step above. The 2014 Minnick Hills Syrah was one of the few 2014 Syrahs that seemed to escape the reductiveness that (unfortunately) characterized several of their peers at this tasting and showed a beautiful mix of black fruit, mouthwatering acidity and spice. The 2015 Seven Hills Cabernet Franc demonstrated all the things that are beautiful about Washington Cabernet Franc (More on that below). It had vivacious, high intensity aromatics of violets and blackberry, medium-plus body with silky tannins.

Kontos Cellars— Poured 3 reds (Cabernet Sauvignon, Malbec and blend) plus a bonus bottle blend named Beckett after the winemaker’s daughter. Founded by the sons of Cliff Kontos of Fort Walla Walla Cellars, the trademark seen throughout the Kontos wines was gorgeous aromatics and pitch perfect balance between oak, fruit, tannins and acidity. Even the two 2014 wines (Cab & Alatus blend) stood out but the star of the flight was the wine club member’s only release Beckett blend. A blend of 61% Cabernet Sauvignon, 31% Merlot and 8% Syrah, the 2013 Beckett showcased Kontos’s high intensity aromatics with a mix of red and black cherries, red floral notes and lots of savory spice.

I’m very glad that I didn’t miss this table.


Tertulia Cellars— Poured 3 reds (Rhone blend, Syrah and Cabernet Franc). This is a little of a cheat since Tertulia is not really a newbie. Founded in 2005, I did try some of their early releases several years ago and wasn’t that impressed. I figured after nearly 10 years, I should give them another shot and boy am I glad I did. The 2013 Riviera Galets “The Great Schism” Rhone blend was outstanding.

A blend of 50% Grenache, 40% Syrah, 7% Cinsault and 3% Mourvedre, this wine would do extremely well in a tasting of Châteauneuf-du-Pape. Beautiful savory, meaty nose but with enough rich dark fruit to clue you in that it was a New World wine. This wine also had one of the longest finishes of the night. The 2014 Whistling Hills Syrah had some of the 2014 reductive notes but it blew off fairly quickly with some air. The 2015 Cabernet Franc, like the Lagana above, was delicious.

Other wineries that impressed me were Caprio Cellars (especially the 2015 Walla Walla Red), Solemn Cellars (especially the 2014 Pheasant Run Cabernet Sauvignon) and Vital Wines (especially the 2016 Rose).

Old Favorites that Shined

You can never go wrong with Woodward Canyon and their 2014 Artist Series is a worthy follow up to the 2013. The 2014 Old Vines also did very well. In fact, along with the 2014 wines that are noted throughout this post, Woodward Canyon seemed to be one of the few producers to have 2014 wines that weren’t showing any green or reductive notes. (More on that below)

Despite enjoying their estate red for several years, I actually never knew that Figgins produced an estate Riesling and it was fantastic! From the 2016 vintage, the Riesling is decidedly on the dry side and had all the gorgeous white flower, apple and apricot notes that Washington Riesling is known for. Truly a top shelf Riesling that would go toe to toe with the best of Alsace and the Mosel.

Anna Shafer of àMaurice continues to show why she is one of the best winemakers in the state working not only with her estate vineyards but also making a mouth-filling but elegant 2015 Boushey Vineyard Grenache and a 2016 Connor Lee Chardonnay that would tickle the taste buds of even the most ardent Meursault fan.

The Bledsoe Family rose was also very tasty.


Doubleback introduced their 2015 Flying B Cabernet Sauvignon. I got the first taste of a brand new bottle and I was highly impressed with how aromatic and flavorful it was for a pop and pour young Cab. While I enjoyed the regular flagship Doubleback Cabernet Sauvignon, I will say that for half the price the Flying B is giving it a run for the money. I would highly encourage folks to sit on the flagship Cab for 5-7 years from vintage date and drink the Flying B while it ages.

Geeky Grapes on Display

While Washington State and Walla Walla wineries are known for fantastic Cabernet Sauvignon, Merlot, Syrah and Riesling, it was fun seeing winemakers embrace more obscure varieties like Albariño (Adamant Cellars), Grenache blanc (The Walls) and Carménère.

Paul Gregutt notes in Washington Wines and Wineries that the Figgins family of Leonetti were likely the first to plant Carménère in the state with cuttings they got from Guenoc Winery in California. Those cuttings were eventually shared with Colvin Vineyards that produced the first varietal Carménère in Washington in 2001. Since then the grape’s acreage in the state has expanded with plantings in Alder Ridge Vineyard, Minnick Hills, Morrison Lane and Seven Hills Vineyard.

I tried to figure out what vineyard in the Wahluke Slope had Carménère but my question was brushed off because they wanted to “highlight the AVA and not the vineyard.”
Um….okay.


Among the numerous wineries featuring a Carménère at the tasting were Balboa/Beresan Winery, Drink Washington State (from Wahluke Slope), Reininger Winery and Skylite Cellars. I missed out on trying the Reininger but was fairly impressed with Drink Washington State’s offering. But admittedly at $26 you are paying for the uniqueness of the variety in Washington and, right now, it is hard to compete with some of the Carménère coming in from Chile that often delivers outstanding value under $15.

Probably the geekiest wine at the tasting was Foundry Vineyards’ Stainless Steel Chardonnay from the Columbia Gorge. A Chard? Geeky? It is when it has 6% Maria Gomes blended in. Also known as Fernão Pires, Jancis Robinson notes in Wine Grapes that this obscure Portuguese grape variety is actually the most widely planted white grape in Portugal with over 41,500 acres. It is believed to have originated in either the Bairrada DOC or in the Tejo region but it can be found throughout the country including in the Douro. In the US, though, it is quite the rare bird.

Pay Attention to Washington Cabernet Franc

Walter Clore encouraged the first plantings of Cabernet Franc in the mid-1970s as part of Washington State University’s experimental blocks. In 1985, Red Willow Vineyard in Yakima planted the grape which was used by Master of Wine David Lake at Columbia Winery to produce the first varietal Cabernet Franc in 1991. Since then the grape has seen growth from 150 acres in 1993 to a peak of 1157 acres in 2006 only to decline to 685 acres by 2017.

Which is a crying shame because of how absolutely delicious Washington Cabernet Franc is!

The 2012 Spring Valley Katherine Corkrum Cabernet Franc was, hands down, one of the best wines in the entire tasting.


While Old World examples from places like Chinon and Saumur-Champigny in the Loire can be light to medium bodied and herbal with trademark pencil shaving notes, examples from Washington hold up to the weight and profile of the state’s best Cabernet Sauvignon and Merlot. Here Cabernet Franc can develop perfumed blue floral aromatics with some subtle fresh forest floor earthiness that add layers. The dark raspberry and blueberry carry a juicy edge due to the grape’s natural acidity. With some age, a very enticing fresh ground coffee note often comes out–something that the 2012 Spring Valley Vineyards Katherine Corkrum Cabernet Franc was starting to develop.

Outside of Walla Walla, stellar examples of Washington Cabernet Franc include Chinook Wines, Barrister, Camaraderie, Matthews Cellars, Gamache Vineyards, Chatter Creek and Sheridan Vineyard’s Boss Block.

At the Walla Walla tasting, in addition to the Spring Valley example that was a contender for Wine of The Show, other tremendous Cabernet Francs were showcased by Lagana Cellars (2015 Seven Hills), Tamarack Cellars (2015 Columbia Valley), Tertulia Cellars (2015 Elevation), Tranche (2013 Walla Walla), March Cellars (2016 Columbia Valley) and Walla Walla Vintners (2015 Columbia Valley)

What happened in 2014?

Along with Woodward Canyon, Kontos produced the cleanest and best tasting 2014 reds I encountered at the tasting.


The most baffling aspect of the Walla Walla tasting was how many 2014 reds were disappointing. Despite widely being considered a very good year in Washington State and Walla Walla, in particular, several wines from even big name and highly acclaimed producers showed green pyrazine or reductive notes. One winery had massive volatile acidity (VA) issues with their 2014s. With many wineries also featuring 2013 and 2015 reds, sometimes even of the same wine as their 2014, the shortcomings in the 2014s stuck out like a sore thumb.

And it wasn’t very consistent with one winery’s 2014s being green while another winery’s 2014 example of the same variety would instead have the closed aromas of reduced wines or (at worst with at least 2 examples) the burnt rubber aroma of mercaptans. While the reductive issues are minimized with getting some air into the wine (like with decanting), the green notes don’t go away. I can’t figure a reason why there would be so many green notes in what was a very warm vintage.

As far as I can tell there were no reports of millerandage or coulure which can promote uneven ripeness and hidden green berries inside clusters of varieties like Grenache, Merlot and Malbec. Plus, it was the 2014 Cabernet Sauvignon and Syrahs that were more likely to show green notes. My only theory is that with it being such a large vintage perhaps some vineyards were over-cropped? But given the pedigree of the producers, I feel like that is unlikely.

I honestly don’t know. As noted above, there were still 2014s that were drinking well (and I certainly didn’t get a chance to taste every single one that was being poured) so I encourage consumers not to avoid the vintage but be aware that there is some inconsistency. I’m just reporting on a trend that I observed during this one tasting event.

My Top 5 Wines of the Event

The 2016 Figgins Estate Riesling was an absolute gem.

There were plenty of outstanding wines featured at the 2018 Walla Walla Wine Tasting at McCaw Hall that give me reasons to be excited about the future of the Walla Walla wine industry. This region is well worth exploring at your local wine shops and restaurants. Even with my reservations about many 2014 wines, there were numerous wines poured that I could very enthusiastically recommend. But my top 5 overall were:

1.) 2013 Tertulia Riviera Galets
2.) 2012 Spring Valley Vineyards Katherine Corkrum Cabernet Franc
3.) 2013 Kontos Cellars Beckett
4.) 2015 Abeja Merlot
5.) 2016 Figgins Estate Riesling

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