I'm not a chemist, but you could try using vinegar on a known synth and see what it does, and go from there.Can I use vinegar instead of hydrochloric acid? A site that describes the acid test as above says that you can substitute vinegar but it’ll have a less noticeable reaction. Anyone tried it for this purpose?
I have a little guy that seems to be a synthetic based on size and shape, but seems finer than most typical synthetic razor hones. I would love to test it and vinegar is much easier for me.View attachment 1452716View attachment 1452717