colcothar 的定义
Chemistry.
- the brownish-red oxide of iron produced by heating ferrous sulfate: used chiefly as a pigment in paints and theatrical rouge, and as a polishing agent.
更多colcothar例句
- The wooden disc is also employed for this purpose with putty, colcothar, or washed tripoli.
- When the cork or wooden disc edged with hat felt is used for polishing, putty or colcothar is applied to it.
- No additional colcothar after the first is required in this part of the process; but only a drop of water from time to time.
- Emery with oil is used for grinding down, and tin-putty or colcothar for polishing.
- Colcothar of Vitriol, and Crocus of Mars, are old names for red oxide of iron.