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Originally Posted by mcaswell
I have some notes on anodizing titanium (found in a dusty corner of my hard drive)
Acidrain's statement that the knife is titanium would certainly give the colors shown.
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I've not done much Ti yet, but I've anodized a bit of Niobium for the wifes jewelry projects. The colors range is quite similar to Ti.
I use a solution of about 5 grams of Borax in a quart of water. Almost anything that makes the water conductive, but doesn't harm the metal will do the job. No acids or nasty chemicals required.
Here's a Nb color sample I made earlier this year that shows Color Vs. Volts for niobium
http://www.weirdstuffwemake.com/weir...or_samples.jpg
Steve