Anodizing Question

What is the highest voltage that can be used in anodizing? I have never seen titanium anodized to the color red. Most of the posts I've read say that the solution is really working at about 125 volts. Can you go higher? Safely of course!! Thanks.
Tom

Tom,

I'm not the world's leading expert on this subject, but I don't think you can get a real 'red' out of titanium anodizing. There is a reddish magenta but that's about it.

I have a commercially built anodizing unit that goes to 130 volts. It goes through the whole rainbow of colors between 0 and about 50 volts. Going higher just seems to go through the rainbow again with very little, if any, difference in the colors. After about 90 volts the solution is boiling and things are getting nasty so I've never found a good reason to go there.

If you find a reason, I'd like to hear about it...

Red is the hardest color to hit. It ussually comes out pink or purple.
It's funny, you can get red in the rainbow colors of anodizing, but not a solid color of it anywhere.
It's somewhere between straw and purple.

Ray if you go to the 90 or so volts literally for only one or two seconds you will get the "rainbow " on your liners and under certain conditions like some colors of pearl it real can do some nice things just as an one color can. Regards. Frank.