I tried finding Ferric Chloride on Maui and in Oahu and Radio Shack told me there was no more in the state at any of their locations. Furthermore, they said, there would be no more coming as Radio Shack has discontinued the product. I have also had them tell me that it is not an item they can ship or can order as it is restriced due to it's hazardous nature. Which left me wondering how the frickin' stuff got on their shelves in the first place out here on an island. Anyway, I went to e - bay and bought a pound of anhydrous ferric chloride from a guy called quartzpegmatite. Cheap, prompt, easy. I played with the strength, starting mellow and adding a small scoop to the etch if I deemed it needed to be stronger. I used distilled water, maybe 20 oz. for a small hunter blade, with maybe 3 - 5 heaping teaspoons of powder. That was for cable damascus, all patterns/steels etch slightly differently so I guess just play with the proportions.