This turbidity, if I remember the cyclopaedia aright, is tannate of fibrin, or leather.
"The Whitehouse Cookbook (1887)" by Mrs. F.L. Gillette
Perchloride of tin, in a similar manner, yields insoluble tannate of tin with tannic acid.
"The Chemistry of Hat Manufacturing" by Watson Smith
Tannic acid, not as free acid, is combined with caffein as a tannate.
"Human Foods and Their Nutritive Value" by Harry Snyder
The mordant used, tannic acid, has the property of combining with the dyes of this group to form insoluble coloured tannates.
"The Dyeing of Cotton Fabrics" by Franklin Beech
Another method of mordanting cotton is to fix the metallic salt on the fibre as a tannate instead of an oleate.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8" by Various
Merlot-Tannat Vin de Pays des Côtes de Gascogne 1997.
Related Wine Search for DOMAINE DU MAGE Merlot-Tannat Vin de Pays des Côtes de Gascogne 1997.
Not only did the 2007 vintage provide a chance to make classic Zinfandels all over the state, but there's also plenty of talent being directed to more unusual fare, whether it's Gamay Noir, Tannat or more unusual combinations.