Fuse potassium dichromate (19) in a porcelaincrucible.
在瓷坩埚中熔化重铬酸钾(19)。
2
A porcelaincrucible was heated to a dull red color, placed on the test material, and allowed to cool to ambient temperature.
将置于所测试材料表面的陶瓷坩埚,加热至暗红色然后让其冷却,温度降至室温。
3
Test a: porcelaincrucible? A porcelaincrucible was heated to a dull red color, placed on the test material, and allowed to cool to ambient temperature.