When I started looking for it a few years ago I couldn't find it anywhere. Evertone had it in their catalogues but nobody had it in stock. Someone said it was because of new hazardous shipping regs.. I started researching and decided to make my own. I found a local laboratory supply house who had nitric acid in stock and the price was very reasonable. You have to have a business license to buy it though. The stuff is very potent. I mixed it outside and stayed at arms length with protective clothing and chemical gloves, face shield, etc...,. You don't want to breathe the fumes from this stuff. It is a relatively simple process to make the stain. I found some old recipes and I think there is some info on it in the Foxfire Book from Hacker Martin if I remember? I made mine with about a 1 to 3 ratio of nitric acid and distilled water. Then I added steel wool very slowly into it until it wouldn't dissolve any more. Remember your high school chemistry and make sure to mix in the right order to avoid a violent reaction. I made about a pint jar full a few years ago and need to make some more I'm about out. It gave a very nice color. I applied with a wad of rag in a split stick and smoothed it out with another rag to even the color then heated the stock very carefully. Finished with multiple coats of oil rubbed in well.