Does anyone have any ideas about another chemical to use or how to stop the Gravoxide from staying active? Joe MidkiffĪwards industry - Statesville, North Carolina It looks fine for a few days but then gets fuzzy looking (spider webs out from the text) because the Gravoxide isn't neutralized (maybe?) and keeps working. We are lasering brass with a YAG laser and then using Gravoxide to turn the lettering black. If it's a more durable coating, you can probably remove it with Aircraft Stripper which will not hurt metal, but is really noxious stuff absolutely demanding goggles, rubber gloves, and truly excellent ventilation (be sure to consult recent EPA releases before deciding whether to use it). If the coating is brass lacquer, you can remove it with with lacquer thinner. I'd recommend an acid pickle to remove existing oxide or whatever method you have to get the metal very, very clean first. Brasso polish does not readily remove this finish. It's advertised as a blue/black oxide finish for steel but it is very effective on brass/copper. It's more readily available in Birchwood-Casey Gun Blue Gun Bluing. The product they use is called Gravoxide or oxidizer. In fact, it is the chemical trophy engravers use on a laminated brass plaque to make the lettering black (the lettering cuts through the lacquer). Selenium dioxide is a fantastic chemical for blackening copper and brass. This is an excellent product and works great. It will turn copper or silver from brown to black. Link - as an Amazon Associate, earns from qualifying purchases)Ī. The pieces I am engraving/etching are an oval of 1/2" x 1" I was hoping to obtain something very cheap that also has some sort of shelf-life (most cost-effective). I do not want to use Liver of Sulphur (due to the smell) but am open to any other suggestions. polishing the surface, and have the black engraved letters remain. I want to blacken the engraving on a copper piece. I'm having a similar issue with trying to find Sodium PolySulfide which I have read here, also will turn copper black.
If this is not a product easily purchased, what is the chemical make-up (formula) and I will make my own batch. I'm good with Google searches, but can't find a source anywhere that I could find to purchase. From this site I've read that "Zinc Purifier" is an easy and safe way to turn copper to BLACK. I would appreciate help in locating a source(s) for this "zinc purifier". Ray recommended a 1% room-temperature dip of "zinc purifier" that is used in a "cyanide zinc process" as a non-wipe system for this blackening process. I recently read a response by Ray Delorey regarding chemically blackening copper.
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