"pp" > wrote in message
om...
> The fining agents work by attracting oppositely charged (+, -)
> particles. That's why kits come with 2 clearing agents (like bentonite
> and isinglass) or the mentioned kieselsol/gelatin, kieselsol/chitosan
> combos. So on your 2 batches, you've added both types of clearing
> agents and the wine cleared. On the 3rd you added just one and it
> didn't. It looks like you need to add the bentonite or another
> clearing agent that attract the same type of particles as bentonite.
> Sorry, don't have my reference books here so can't be more specific.

That's the gist of it. It's called counterfining, and it's often
necessary - especially in the case of white wines, which tend to be low in
tannin.

Tom S