A porcelain crucible 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。
Test a: porcelain crucible? A porcelain crucible was heated to a dull red color, placed on the test material, and allowed to cool to ambient temperature.