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| 配方类型： |
METALS AND THEIR TREATMENT |
| 配方说明： |
Blackening Stainless Steel (Japanese Patent 3355 (1957)) |
| 配方组成： |
Sod. Hydroxide (50% Solution)/1 l.
Sodium Sulfide/55 g.
Nickel Chloride/30 g. |
| 配制方法： |
Immerse object in above and heat at 130'C. for 2 to 5 hours. |
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