We are pleased to offer for sale this Super Safe Watermark Fluid by Prinz. Each bottle contains 250 ml. Prinz Watermark Fluid is safe for all stamps including photogravure, lithographed, and engraved. This Super Safe Fluid is non-toxic, non greasy, and quick drying. Simply place stamp face down in standard watermark tray and completely cover with fluid. If there is a watermark, it will appear instantly. Remove stamp with stamp tongs and place on clean surface or stamp drying book. Make sure the stamp is dry before handling.