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.