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Blue-Black Finish on Steel
| 配方类型： |
ELEMENTARY Preparations |
| 配方组成： |
hitric acid/1/2 oz
iron chloride/1 lb
water/1 gal
hydrochloric acid/4 oz
copper sulfate/1/2 oz |
| 配制方法： |
A) place the object in molten sodium nitrate at 700-800 F for 2-3 min remove and allow tt cool somewhat wash in hot w3ater dry and oil with mineral or linseesd oil B) then put the object in the following wolution for 15 min allow to dry for several hours place in a solution again for 15 min remove and dry for 10 h place in boilong water for 1/2 h dry and scrtch-brush very lightly oil with mineral or linseed oil and wipe dry |
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