Boracic acid

Mixed with lemon juice or white vinegar it makes a white paste-like cleaning agent for metals for exam brass, aluminum or copper, or with water for other cleaning applications such as removing light stains from porcelain CAS Number

• 868-14-4 

Synonyms potassium hydrogen tartrate, cream of tartar,potassium acid tartrate,monopotassium tartrate,potassium;(2R,3R)-2,3,4-trihydroxy-4-oxobutanoate