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Today we have a guest post from Brenda Audino, CWE. Brenda tells us about her brush with Flash Détente – very interesting!

I recently tasted a modest (read inexpensive) wine that had a bright purple hue and Jolly Rancher fruit aromas.  I enquired whether the wine had undergone Carbonic Maceration as it seemed to fit that profile.  It was explained to me that although the results are similar, this particular wine was produced using Flash Détente technology.  Being ever curious, I wondered what is Flash Détente; when, why and how is it used in the wine production.

To explain Flash Détente, we need to understand that one of the principal goals in producing red wine is the extraction of color and flavor from the skins.  This extraction is usually achieved by a combination of maceration and fermentation. Here is a review of three popular means for extraction including the new (to me) Flash Détente.

Classic maceration is achieved at low temperatures of 24-32°C (75-90°F) requiring extended contact between the juice and grape skins.  The fermentation process, while producing alcohol, also extracts the polyphenols from the skins.  One of the byproducts of fermentation is the release of CO₂ which raises the skins to the surface forming a floating cap.  This floating cap is subject to acetic bacteria as well as other contaminates and, if left exposed to the air, can turn the entire batch into vinegar.  A floating cap also does nothing to extract further color and flavors into the juice.  It is therefore necessary to mix the skins back into the juice by one of many processes (punch down, pump over, rack and return, etc.)

Thermo-vinification uses heat to extract color and flavors from the skins.  The crushed grapes are heated to 60-75°C (140-167°F) for 20 to 30 minutes.  The must is then cooled down to fermentation temperature.  This process gives intensely colored must because the heat weakens the cell walls of the grape skins enabling the anthocyanins to be easily extracted.  This process can result in the wine having a rather “cooked” flavor.

While I was researching these technologies, I recalled a previous visit to Château de Beaucastel where I learned that make their iconic wine using a modified process of Thermo-vinification.  At Château de Beaucastel, the grapes are de-stemmed and the uncrushed grapes are passed rapidly through a heat exchanger at 90°C (194°F) which only heats the surface of the grapes, not the juice.  The heat is sufficient to weaken the cell wall of the grape skins enabling for easier extraction of anthocyanins, since the juice is kept cool the wine is less likely to have any cooked flavors due to this modified process.

Flash Détente is essentially an evolution of the traditional thermo-vinification method.  The process involves a combination of heating the grapes to about 82°C (180°F) and then sending them into a huge vacuum chamber where they are cooled.  During this cooling process the cells of the grape skins burst from the inside making a distinct popping noise.   Similar to traditional thermo-vinification, this process enables better extraction of anthocyanins and flavor compounds.

The Flash Détente process creates a steam that is diverted to a condenser.  This steam is loaded with aromatic compounds including pyrazines (vegetal, green pepper and asparagus).  Because vapor is removed, the sugar level increases in the remaining must.  The winemaker can choose to work with the higher sugar levels or dilute back down by adding water.  Most winemakers discard the condensation or “Flash Water” as the aromatics are usually highly disagreeable.   The winemaker now has multiple choices.  The flashed grapes can be pressed and fermented similar to white wine, the must can be fermented with the skins in the more traditional red wine production manner, or the flashed grapes can be added to non-flashed must that underwent classic maceration and then co-fermented.

Flash technology differs from traditional thermo-vinification because the traditional method does not involve a vacuum and there is no flash water waste produced.  Winemakers who are familiar with both methods have noted that the tannin extraction with thermo-vinification is less than Flash Détente.  Winemakers also note that Flash technology is better for removing pyrazine aromas.

In Europe during the early years of flash technology, it was mainly used for lower quality grapes or difficult vintages that had problems needing fixed.  Now the use of this technology is expanding its application to all quality levels of the wine industry.

According to Linda Bisson, a professor of viticulture and enology at UC Davis and one of the researchers working on the project, enologists are looking at what characteristics are lost or retained per grape variety.  They are also looking at the character and structure of tannins in flashed wines.  Bisson states that turning flashed grapes into a standalone wine is possible, but most winemakers see it as a tool for creating blends.  “It’s something on your spice rack to blend back in.”

The use of Flash Détente can be surmised as “It’s an addition to traditional winemaking, not a replacement.”

What are your thoughts on technology in the wine industry?  Does technology improve the wine or make it more homogenous?  

Photos and post by Brenda Audino, CWE. After a long career as a wine buyer with win Liquors in Austin, Texas, Brenda has recently moved to Napa, California (lucky!) where she runs the Spirited Grape wine consultancy business. Brenda is a long-time member of SWE and has attended many conferences – be sure to say “hi” at this year’s conference in NOLA!

Are you interested in being a guest blogger or a guest SWEbinar presenter for SWE?  Click here for more information!

Today we have a guest post from renowned Wine and Spirits Educator Harriet Lembeck. Read on to hear Harriet’s take on Furmint!

If you haven’t already heard about Furmint – Furmint is the grape that makes the famed sweet wine Toakaji.

Aszu (‘dried up’ or ‘dried out’) grapes

When Samuel Tinon, a sweet-wine maker in Bordeaux, decided to move to the Tokaji region of Hungary, he was ready to make wine from its Aszu (‘dried up’ or ‘dried out’) Furmint grapes — grapes attacked by the desirable botrytis cinerea, or noble rot. These grapes are so concentrated that they have to soak in vats of young wine to dissolve their flavors. But when Tinon moved to Tokaji, botrytis was decreasing in his newly chosen region.

Expecting to make Aszu wines at least three times in a decade, the number of opportunities dropped to a little more than two times in a decade, and sometimes less than that. Due to climate change, a great deal of rain meant either no crop at all (as happened in 2010), or harvesting all of the Furmint grapes earlier — not waiting in the hopes of harvesting Aszu grapes — and therefore making dry white wines from earlier-picked grapes instead.

Asked about an apparent climate change, Tinon says: “We can’t see warming. What we see are erratic vintages with severe or extreme conditions — hot or cold, wet or dry. In the past, Tokaji Aszu was harvested at the end of October and the beginning of November, with botrytis and high sugars. This is still happening, but more often we have to change our production to dry Furmint wines without botrytis with an earlier September harvest, bigger crop, more security, more reliability and with a chance to get your money back.”

With winters becoming a bit warmer like in 2014, the fruit-fly population is able to ‘over-winter,’ and begin reproducing very early in the season, causing the spread of bad rot. This was told to me by Ronn Wiegand, MW, MS and Publisher of ‘Restaurant Wine,’ who is making wine with his father-in-law in Tokaji.

Ironically, Comte  Alexandre de Lur Saluces, owner of Château de Fargues and former co-owner of the fabled Château d’Yquem, said that although his area is getting warmer and drier, he feels that “global warming could be a help for Sauternes, and enable any of those who chaptalize these wines to avoid the practice.” He continues, “Many people in Sauternes are  producing dry white wines. Their production is increasing, and even Château d’Yquem is producing more dry wine.”

Hungarian winemakers from Tokaji are increasing dry white wine production as well. A new website, www.FurmintUSA.com, was created by 12 member wineries that presented a Furmint tasting in Sonoma, CA in November 2014. The Blue Danube Wine Company, which imports many wines from all over Hungary, has six producers from Tokaji that are producing dry Furmint wines (many from single vineyards). Martin Scott Wines imports Royal Tokaji’s dry Furmint wine, coming from the company co-founded by Hugh Johnson and Ben Howkins, in London. These wines are all delicious, showcasing the minerality of volcanic soil.

Considering that in 2014, Hungary abolished the categories of Tokaji Aszu 3 and 4 Puttonyos (baskets of Aszu grapes), leaving only the sweeter 5 and 6 Puttonyos examples, the door has been opened for Dry Szamorodni. This rich, dry white (amber colored) wine produced from Furmint grapes has a portion of grapes which have some botrytis co-fermented to dryness, and also uses some flor yeast, giving the wine some fino or amontillado Sherry-like flavors.

This wine is very laborious and time consuming to produce. The 2007 Tinon Dry Szamorodni is the current vintage in the market, released after a minimum of 5 years of aging. This is a unique wine, a keeper, and is important to the history of Tokaji, linking the modern dry wines to the traditional Aszu wines.

If you haven’t tried it – you should!

HARRIET LEMBECK, CWE, CSS, is a prominent wine and spirits educator. She is president of the renowned Wine & Spirits Program, and revised and updated the textbook Grossman’s Guide to Wines, Beers and Spirits. She was the Director of the Wine Department for The New School University for 18 years. She may be contacted at hlembeck@mindspring.com.

This article was originally published in the article was originally published in
Beverage Dynamics Magazine – reprinted with permission!