Talk to me about bluing

To avoid rust one have to keep in mind that neutralization needs time.
This applies when we spray windex and promptly rinse without giving it time to kill all the FeCl when we etch, for example, but cold bluing is somewhat the same process.
Another important step is removing the loose oxydes (by lightly sanding) as they can trap moisture and promote rust. And boiling in basic environment helps turning the active rust into its passive form
 
One more vote for Oxpho blue. Bronwells carrys it. I have a complete 223 done with it that looks better than most other guns. It is great for small parts.
 
Oxpho Blue is probably the best cold blue. That said, it's still a cold blue.
It is not a decent finish for a gun, or knife. It wears quickly.
Cold "blue" is not even real bluing-it's a coating of copper sulphate that is electrolessly applied.
 
What about bluing wrought iron? Does it turn out looking any good?
 
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