try putting some aluminum in ferric chloride... just do it outdoors and with nothing valuable nearby :lol:
I tried some home anodizing last year. an anodizing guide suggesting using "a ferric acid" to remove the tarnish left after stripping, caused by other metals in the aluminum alloy. since I had ferric chloride handy, I tried it... it started fizzing faster and faster and almost boiled over before I had a chance to get it out. not surprisingly, it also got very warm very quickly!
to dissolve aluminum oxide (anodization) you should use lye (sodium hydroxide) despite what the guides say, I was totally unable to find any locally so I used powdered drain cleaner instead, and it worked okay. I also got some industrial-strength drain cleaner that was more concentrated lye and worked a little better.
if your photoresist can withstand lye then I guess it would work...
but considering the amount of effort it takes to anodize, I imagine it would only be worth it for very important projects... dealing with strong acids, strong bases, and large amounts of electricity isn't something I, personally, would want to do on a regular basis. :roll: not to mention, it takes a while.