yes its carbon steel and yea thats what i was afraid of.is this carbo steel?
if so melt a cup full of instant coffee in approx 1L of COLD WATER ( this is very important because hot water ruin the acid in the coffee), then clean the blade with Windex a couple of times, make sure not to touch the blade at all, then soak it in the instant coffee liquid for a good 24hr, this should do the trick.
Thought I'd share. This was my first attempt at a feather pattern. I etched in Ferric Chloride and put it together. I wasn't happy with the look so I thought I'd try a coffee etch. Well, as you can see the difference is quite contrasting. So, the pro's: The coffee etch has a lot of...www.theironforgefire.com
If it's stainless steel it might also work but not as good you can try silver Blackner but it's much more aggressive. anyhow a chemical-free safe process to darken your blade
Lets us know how it went
the only time it was heated is when we made it in japan few years ago and blackened it using the same method in the video above at 9:10im saying that if you already put it in the forge and heated it up there is not hardened steel left in it