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Neutralizing ferric chloride

2002

I've been using ferric chloride [on eBay or Amazon] to etch Copper. Then I put the copper in a furnace to anneal it and an awful odor is produced when it is taken out. What could this be, how do I get rid of it, and is it harmful? My first thought is to put in a base solution to neutralize the acid.

Thanks for any help,

John Deer
- Windham, Vermont

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