Ready-to-use solution Oxalic acid 2 % for use in histology and/or cytology for oxidizing tissue samples or for electrolytic polishing of high-alloy steels in metallography Caustic Mg, Mg-Al, Mg-Al-Zn, Mg-Mn, Mg-Th-Zr, Mg-Zn-Zr. For the visualisation of grain sizes.