I am posting this here so everyone can give it a go . This product , which is used to blacken or darken brass and solder joints on Stained Glass hobby projects is great for ,Guess What ? Darkening All metallic tank tracks that are sold aftermarket .Now it doesn't stop here .Do you want aged britannia metal ship fittings without using paint ( so you have an aged metallic luster .) Well this product is just what the doctor ordered .
I believe a similar product is available through MICRO-MARK or SQUADRON but I haven't checked . Now the beauty of this product is this ,if you use a PYREX or CORIAN bowl it won't ruin the container . I haven't tried to use iit in plastic because of the copper and other metallic salts in it , Plus the etching acid . Nice part is this .Dip your part in there and watch it get dark and aged looking .You can let it stay till the solution stops getting any blacker . then lift the parts out with STAINLESS tweezers and rinse in a bowl of water and Dawn detergent . Rinse with clear water (Warm ) and then let air dry on a paper towel .
You will have a part , nicely age blackened and you didn't have to use washes or paint to get there .This is not intended to do away with those steps , but , to make them easier if you don't want to load the piece with paint in the first place .Now step back and admire those nicely aged parts , knowing you didn't have to take steps you are not ready for or don't want to do .