Synthrapol removes excess dye from hand dyed fabrics. It also removes sizing from fabric prior to dyeing. Will allow even color when used in the dye bath. This package contains 4z of sizing and dye remover. WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Conforms to ASTM D 4236. Made in USA.