| 配方类型： |
ELEMENTARY PREPARATIONS |
| 配方说明： |
3 min. Remove and allow to cool somewhat, wash in hot water, dry, and
oil with mineral or linseed oil.
B Then put the object in the following solution for 15 min: |
| 配方组成： |
Nitric Acid**/1/2 oz
Iron Chloride/1 lb
Water/1 gal
*Inflammable
Hydrochloric Acid*/4 oz
Copper Sulfate/1/2 oz
**Corrosive |
| 配制方法： |
Allow to dry for several hours. Place in a solution again for 15 min, remove and dry for 10 hr. Place in boiling water for 1/2 hr, dry, and scratchbrush very lightly. Oil with mineral or linseed oil and wipe dry. |
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