Liquid isinglass 1L

How do I know which fining agent to use?
One of the most convenient methods, and still one of the best, is trial and error: take a number of samples from the wine to be fined and put them in test tubes. Add a few ml or grams of a different fining agent to each test tube. Another test tube of wine/juice with pecto enzyme and one with alpha-amylase (in starch rich fruit) are helpful. Leave to clear for a few hours and you will immediately see which fining agent gives the best result!