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What is Cold Soak?


Cold Soak is a phrase you hear winemakers casually throw out but many wine lovers, including me, arenít too clear about what it actually is. But when I heard the Ďwine expertí at a local shop tell customers at a tasting that cold soak means that grapes, after picking, were put into a tank of icy water I felt sure that explanation couldnít be correct.

So I was interested in attending a talk on the subject by Josh Rude who is winemaker at Wasson Brothers and Buddha Kat Wineries in Oregonís Willamette Valley.

It turns out that cold soak, used mostly in red wine making, simply means keeping freshly picked grapes at a low temperature before fermentation.
Josh explained that after picking the grapes and removing their stems the grapes were crushed and then put into a fermenting tank. So far this is the standard process for making red wines. But instead of allowing fermentation to start as normal, the tank is cooled down to 40-45 degrees Fahrenheit (4.5ó7 degrees Celsius). At this temperature fermentation doesnít start and it is too cold for any micro-organisms to be active.

This is the cold soak and it can continue for some weeks.

The purpose of leaving the juice and skins together for a long period is that more colour and flavours are extracted from the skins, but without getting unwanted tannins.

The cold soak process continues until the winemaker decides that it has done its job. How long that will be depends on the grape varieties in the tank and the style of wine that is being made.

When the time is right the temperature is raised and the fermentation is allowed to start either naturally or, more commonly, by the addition of yeast. Fermentation extracts colour and tannins from the skins, but prior cold soaking is considered by its advocates to add extra layers of flavour and more complexity in the finished wine.

Talk about wines on our forum.





Peter F May is the author of Marilyn Merlot and the Naked Grape: Odd Wines from Around the World which features more than 100 wine labels and the stories behind them, and PINOTAGE: Behind the Legends of South Africaís Own Wine which tells the story behind the Pinotage wine and grape, also available for the Kindle.







Disclosure: Josh Rude was speaking at the American Wine Society Annual Confernce in Portland Oregon. The author travelled to the Conference at his own expense, and as a conference speaker had free entry to this seminar.
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Content copyright © 2014 by Peter F May. All rights reserved.
This content was written by Peter F May. If you wish to use this content in any manner, you need written permission. Contact Peter F May for details.

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