LIVER OF SULPHUR GEL: 4 oz. wide mouth jar – You can paint this on with an art or utility brush for precise application on your jewellery piece. It stays where you put it, then washes off with warm water when you’ve achieved the amount of oxidation desired. Fantastic!! Formulated for extended shelf life versatility and convenience. The gel makes it easy to use and less mess with better results. Non-hazardous. May be used in concentrate or diluted in warm water for desired effect.