Ferric Chloride 40% - 1 Quart (32 FL Oz) - Copper Etchant Solution - Uses: Water Treatment - Domestically Sourced Chemical - Made in America - Alliance Chemical

I used this to etch some home-grown PCBs. It worked great, and based on what I've read, I poured the excess etchant back into the bottle to be reused. Each time I used it, it took longer and longer to finalize the etching procedure. I guess this is not surprising, in the future I'll probably not reuse the old etchant. One warning to note - I used it in my laundry room sink and poured the used etchant into the drain. The laundry room sink was one of those $100 white Home Depot sinks. When I finished, the sink was no longer white, so I had to replace it to keep the peace. The stains could not be removed with alcohol, bleach, acetone, or gasoline.

It is easy to use and creates beautiful colors on saggar fired pottery

Great product. Provides reliable and repeatable results.