HYDRO-SOLVE

chemicals used in connection with photoengraving plates, namely, developers, aqueous resin solutions of dye and mold inhibitors, top removers, and etchants, additives and filming agents used for magnesium, zinc, brass, and copper photoengraving plates

engravers' plates of magnesium, of copper, of brass, and of zinc, coated for use with developers and non-coated for use with mechanical or hand engraving