Light figures were observed on the three principal crystallographic planes {0001}, {1120} and {1010} of zinc crystals, which were etched for various time-intervals with variously concentrated aqueous solutions of various acids, alkalis, and salts. The suitability of observed figures for determining orientations of zinc crystals with the light-figure method was examined, and light figures obtained by etching for 20 minutes with boiling saturated aqueous solution of potassium hydroxide was found to be the most suitable for the perfect determination (the determination of all angles which the geometrically predominated axis of a crystal makes with the hexagonal axis and digonal axes of the first or second kind)
