After you do your research and look at some tutorials you can make an anodizer for $50 for the Variac, a couple bucks for the bridge rectifier, and the cost of a mason jar, plastic canvas liner to keep things seperated, alligator clips, primary wire, scrap Ti for the other electrode that is not holding the work, and diet coke. Although some others use a soap type blend. Lemme cut and paste the info I have saved. The Howell tutorial is a good one.
Anodizing Ti
Do to complicated molecular reasons, anodised titanium goes a pretty colour. This colour varies with the voltage used. This ranges from gold for about twenty volts, via purple and pink at about 100 volts.
All you do is make up some electrolyte solution. I use sugar soap, 10 grams per litre. This is bought from the DIY store for cleaning paintwork prior to repainting to get the grease off.
Find a suitable power supply - use a PC power supply or whatever transfers you've got laying about with a rectifier to make up anything between 20 and 100 volts DC. If you are very clever, you can make a variable voltage supply. The exact colour you get depends on several factors, so experiment
See the image for an example of a bit of anodised titanium rod.
Simply attach +volts to the titanium part, and use a lump of lead sheet submerged into the solution for the cathode. Clean up your titanium to make it clean of finger grease and dip it in to the solution. After a few moments of fizzing it will take on its final colour. That's it!
Anodizing Al and Ti
http://astro.neutral.org/anodise5.shtml
http://www.howellbladesmith.com/index.php?BODY=anodize_titanium
Variac transformer
http://www.mpja.com/prodinfo.asp?number=15162+TR
