Experiment 60: Anodizing Titanium into Rainbow Colors
For my anodizing bath, I used 200mL of tap water with 8 grams of Borax dissolved in it. Then, I sanded my titanium and cleaned it with acetone. It is important to not leave fingerprints on the surface.
I looked at this image to see which voltages anodized titanium to nice colors. Then, I connected the number of 9V batteries necessary to achieve that voltage. Some batteries were at a bit less than 9V, so my first voltage I used was 24V (three batteries). I connected my titanium to the positive on my battery series and clipped a piece of aluminum to the negative. After putting both electrodes in my anodizing bath for half a minute, the titanium had turned a bright blue color!