I'll treat this as a tutorial thread, so it's aimed at everyone.
Firstly it's a matter of finding the "right" chain, not all chain will
forge weld nicely... maybe too much sulphur in the alloy.
Firstly the noobie mistake is to do too much to the chain, and naturally
I did this for my first chain blade. NOTE: If you do too much at this
point you lose the pattern.
Once you have forge welded the chain into something usable, or close to
it (odds on that 10-15% will be crap), then it's a simple matter to
shape the billet into something nice. I sort of figure that if you can
forge weld you can forge a basic knife shape ;-)
I use a 4 to 1 mix of ferric chloride, but recently I have picked up
some ammonium persulphate that I'm going to try (it may not work or it
may... we'll see). If you wanted to you could warm up some straight
white vinegar, as vinegar works and has been used in this way for centuries.
I sometimes use cold white vinegar to bring out a stubborn pattern, on a
blade that has not etched for some reason.
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