The standard go-to solution is ferric chloride. It isn’t too tricky to ... Of course, if you’re diluting the acid with water anyway, the peroxide concentration may be moot.

Compounds with a phenol group will form a blue, violet, purple, green, or red-brown color upon addition of aqueous ferric chloride. This reaction can ... As a control, add a few drops of 1% FeCl3 to ...

Nicholson hand smooth file. I tried chemical sharpening with ferric chloride and It definitely made it feel sharper. The line near te tang after the ferric chloride soak is a thickness difference ...