化学配方数据库
| 配方类型： | METALS AND THEIR TREATMENT |
| 配方说明： | Removing Brass Discoloration |
| 配方组成： | |
| 配制方法： | The discoloration can be removed by immersion in a 10% solution of sulfuric acid, to which can be added about 2-4 oz/gal sodium or potassium dichromate for brightening. |
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