| 配方类型： |
INTRODUCTION |
| 配方组成： |
a) place the object in molten sodium nitrate at 700 to 800°F for 2 to
3 minutes. remo?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 minutes
nitric acid/1/2 oz
iron chloride/1 lb
water/1 gal
hydrochloric acid/4 oz
copper sulfate/1/2 oz |
| 配制方法： |
allow to dry for several hours. place in a solution again for 15 minutes, remove and dry for 10 hours. place in boiling water for 1/2 hour, dry, and scratch-brush very lightly. oil with mineral or linseed oil and wipe dry. |
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