This product is cylindrical, consisting of a hard and elastic empty capsule composed of a cap and a body that can be fitted and locked together. The capsule should be smooth, uniform in color, with a clean cut, no deformation, and no odor. It is available in three types: transparent (neither section contains an opaque agent), semi-transparent (only one section contains an opaque agent), and opaque (both sections contain an opaque agent).
Take 0.25g of this product, add 50ml of water, heat to dissolve, cool, shake well, take 5ml of the solution, add a few drops of potassium dichromate test solution-dilute hydrochloric acid (4:1), and an orange-yellow flocculent precipitate will be produced; take 1ml of the solution under identification (1), add 50ml of water, shake well, add a few drops of tannic acid test solution, and turbidity will occur; take about 0.3g of this product, place it in a test tube, add a little sodium lime, heat, and the gas produced can turn moist red litmus paper blue.
