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Greetings Ken,
Just a bit of a head's up for the readers. "Blacken-it" is great BUT when you have the patina surface you want rub the part or submerge it in Baking soda. This neutralizes the acid etching. Then wash in cool water and pat dry with a paper towel. If you don't neutralize the acid the residue will continue to act even under a coat of paint. This stuff is designed for Model Rail Road projects where the etched metal and metal parts are a bit more heavy duty. They often use a primer then a lacquer coat of paint. With our delicate WWI materials keep these things in mind and you will do ok.
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