Zest-it is an environmentally friendly, non-flammable, non-toxic, biodegradable alternative to ''turps'' and white spirit, made from zest of citrus fruit for cleaning brushes and thinning paint. Non-irritating to the eyes or skin. Turps and white spirit are known to ''leech out'' the natural oil content of the hair or bristle, causing them to become brittle over time. The citrus oil in Zest-it helps maintain the natural oil content of the hair and therefore the integrity of your brushes. Zest-it is re-usable. Allow paint sediment to settle out, decant off and re-use.