Ask Wine Wizard

Natural Fining For White and Rosé Wines


Gin Yang — Sacramento, California asks,

What’s the most natural way to fine white and rosé wines?

Well, an old-timer winemaker I used to work with would say, “The most natural fining agent for any wine is time.” What he meant was that with time, solids fall out, proteins eventually coagulate and fall to the bottom of the aging vessel and tartrates reach an equilibrium so they aren’t in excess and big crystals will precipitate as well. The problem with this approach when referring to fresh whites and rosé wines is that with enough time for all these chemical reactions to occur, enough oxidation and aging might take place in the wine such that it would be well past the time that you would want to bottle it. Whites and rosé wines are typically bottled within 4–12 months of harvest and part of their verve, charm and freshness is lost with extended time in barrel, keg or carboy. That all being said, the fining agent you choose will depend on your definition of “natural.” If you mean using naturally-occurring substances, then things like bentonite (a natural clay that pulls out proteins), potassium bitartrate seed crystals (help precipitate
Response by Alison Crowe.