Wood bleach contains oxalic acid which, when mixed with 1 gallon of hot water, effectively bleaches unfinished or stripped wood quickly and easily. Wood bleach is excellent for removing black water spots and tannin stains in wood. Use on all unfinished woodwork, floors, doors, etc., to lighten wood or match different wood colors. 12 Oz. container makes 1 gallon of mixture. Covers 200 Sq. Ft.