It doesn't take a lot of volts and very little amperage so be careful screwing around with that stuff.
I did it once with nothing but two 6v lantern batteries (the square batteries with spring terminals that you see in big flashlights that have handles on them). Use one battery for whatever color that gave me and two batteries for another color. Then, I went and spent $500 on a professional titanium anodizer. Got a few more colors. In the end, I gave the anodizer away. There is no practical use for anodizing titanium that I could see unless you're making very VERY high dollar knives that will spend their lives in a glass case. Anodizing on titanium has a lifetime measured in hours if you handle it....
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