Light figures produced by the three principal crystallographic planes {0001}, {11_??_0} and {10_??_0} of zinc single crystals, etched for different time-intervals with various acids or alkalis, were observed, and the suitability of those figures for the determination of crystal orientation by the method of light figure were examined. The experimental results obtained are summerized in Table 1. Distinct light figures were observed by a short-time etching with hydrochloric acid of any concentration, with dilute sulphuric acid, or with boiliug saturated aqueous solution of sodium hydroxide or of potassium hydroxide. Of distinct figures produced by etching with hydrochloric acid or with dilute sulphuric acid, figures on {0001} planes are suitable for determining an angle which the geometrical axis of a specimen crystal makes with the hexagonal axis <0001>, while figures on {11_??_0} and (10_??_0) planes are not suitable for determining angles between the geometrical axis of the specimen crystal and the digonal axes of the first kind <11_??_0>. For the perfect determination of crystal orientation, light figures obtained by etching with boiling saturated aqueous solution of sodium hydrxide or of potassium hydroxide are suitable; figures produced by etching with the latter alkaline reagent are more suitable because of a shortness of etching time (about 20 minutes). It was also found that geometrical forms of light figures of zinc single crystals generally change with etching conditions, though their symmetry characteristics are naturally invariable.