The clarity, colour, odour, taste and stability of a wine can be significantly improved through fining. Fining involves the addition of a positively or negatively charged chemical agent to the wine to balance the charge of any suspended particles. The suspension will then agglomerate and settle out. The most frequently used fining agents are bentonite (aluminum silicate clay), activated carbon, gelatin, egg whites and PVPP (polyvinyl/polypyrrolidone). Many books on winemaking provide detailed instruction on the use of fining agents. Again, home trials on small volumes (100 to 200 ml) of wine are recommended.chromatography. Test takes about 10 hours.