Malachite Green CRYSTAL, Basic Green 4 Chemical Formula: 2C23H25N2.HC2O4.2C2H2O4. sical Appearance: green crystals with metallic ulster. Solubility: Soluble in H2OStorage Instructions: Basic green shall be stored in tightly closed container, store in shade, dry and well-ventilated place at room temperature. Avoid to be d with oxidizing chemicals and combustible organic substances. Keep it away from direct sunlight, heat, sparks and open flames. Carefully handle the product and avoid damaging the package. Strength: - 100+3%. Malachite green is an organic compound that is used as a dyestuff and controversially as an antimicrobial in aquaculture. Malachite green is traditionally used as a dye for materials such as silk, leather, and paper. Despite its name the dye is not prepared from the mineral malachite, and the name just comes from the similarity of color.