What is kieselsol?

Answer 1

Kieselsol is a fining agent used in wine making. Described by the manufacturer to be an "aqueous solution of negatively charged, food grade colloidal silicic acid." Appearance is typically white to off white. removes yeast cells, and other undesirable solids leaving a fresher, cleaner looking wine. Often used in wine kits, quantities will vary depending on the grape (or other fruit) used.

Kieselsol is often used sequentially with Gelatin - which is positively charged - in order to remove particles from the wine regardless of their polarity.