Putting acid on a blade will darken carbon steel and do bad things to the edge.
By doing that, you are basically etching the steel, not good.
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Hhhm, thats true for a lot of acids.
I use the bathroom cleaner for my soap kitchen and there is a lot of steel.
I have never seen anything like a stain from using it.
It just cleans excellently.
No its probably just mild enough.
Will try on a carbon steel and let you know.