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Great info,this is the way to get a true Blue like the old colts and winchesters that will last.
Is very time consuming and alot of work tho, used to take me 3 weeks to do a shotgun barrel.be...

Yep,all is well.

from losing the sight in my left eye for two monthes:(

You can really live on the dangerous side,make up some Aqua Rigia,(nitric and Hydrochloric) will disslove Gold and platinum.
Can also spontainiously explode (don't ask me how i Know this:(

No Help on etching,but try some real rust bluing with the acid,long process but it lasts.