Something which I was told here works well, and what i've used for all my etching so far and which DOES work well is a 50/50 solution of FECL from radio shack and 5% distilled white vinegar. FeCl is an etchant but it's actually a base, and the vinegar which is an acid neutralizes it a bit, the result is about the same strength as 1 part FeCl to 3 parts water. It can be hard finding distilled water in places to mix with the fecl, but distilled white vinegar is pretty common, and then you can use the rest of your vinegar as the neutralizer comming out of the etchant before rinsing it off in water. (believe me you want to neutralize it or you end up with bad rust spots on your blades the day after you etched