... pickled plate, etc.(4) Leather Industry: Leather tanning agent, deliming agent, ... and neutralizer.(5) Rubber Industry: Natural rubber polycoagulant.(6) Other: Formic Acia may also be used for ... making printing mordant,fiber and paper staining agent, processing agent, plasticizing agent, foodantistaling agent, animal fodder additive, etc. FORMIC ACID for leather ...