How does acid dye works on a blade?

Joined
May 9, 2023
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I've been seeing a few swords and knives around that have a coloured blade and the only information I could find about it is that it is acid dyed. When googling about acid dying steel all the results point to acid etching and other things that are not what I'm looking for. My questions are:

1 - Does anyone have information on how it is done ?

2 - Does it interacts negatively with the structure of the steel in any way, or it is just a coating ?

3 - I assume they cannot be as sharp as a normal blade, but if sharpened after the process is done, will it fade on the portion of the blade that has been worked on the sharpening stone so the edge will be brought back to full potential?



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Its just a coating, the acid etch just gives the coating a slightly pitted surface to stick to. It will be no more durable than blueing, powder coating or any other coating IMO
 
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