A small amount of ferric oxide is added to a solution of oxalic acid, a commonly used cleaning and bleaching agent. Once the rust is dissolved, potassium carbonate is slowly added to the solution ...
For stubborn stains, try using an oxalic acid cleaner following the manufacturer's instructions. Tannins are naturally occurring compounds found in many trees and plants. They can sometimes cause dark ...
High levels of glucose, albumin, ascorbic acid, tetracycline or cephalexin, or large amounts of oxalic acid, may inhibit the reaction and lead to false-negative results. Vaginal contamination can ...