can't read?
Potassium bitartrate, also known as potassium hydrogen tartrate, with formula KC4H5O6, is a byproduct of winemaking. In cooking it is known as cream of tartar.
P 2285 (OTTO) Potassium hydrogen tartrate, 99% Cas 868-14-4 - used for the galvanic tinning of metals and as a reducing agent in glass making.