Silica sol

Term (also silicic acid hydrosol) for colloids, i.e. finely dispersed solutions of silicic acid (silicon dioxide) in water. The name is made up of silica (for silicic acid) and sol (synonym for colloid). The substance is negatively charged and therefore attracts positively charged substances. Kiselsol has a very high adsorption capacity (attraction of dissolved substances) and is used for the degumming of grape must and the fining of wine.

Silica sol is a classic agent for settling yeasts and for removing other agents such as activated carbon, bentonite or copper sulphate. If negatively charged substances are also to be removed, this is done in combination with positively charged, protein-containing fining agents such as gelatine (silica sol-gelatine fining). A chemically related substance is diatomaceous earth, which is also used in winemaking. See under agents used in winemaking.

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