Anodizing Aluminum
also Anodising Aluminium :-)

        http://www.focuser.com:80/atm/anodize/anodize.html

A superb guide to doing it yourself. He says you need to buy his 
book(s) to learn all about doing it yourself, but this looks like an 
extremely good starting guide, and anyone trying this will probably 
end up buying his book based on the quality of his presentation.

Ref:    Ken Mardle.
Ken notes that type II anodising looks easier and/or safer than making 
homemade PCBs well.




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