Yup. Or use a DC variable voltage power supply.
This is on my list, but I don't need another hobby right now. Although I do have some Ti bowls.....
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You can send them to me. I have a variable power supply that can do most colors on titanium if I remember correctly.
Purple is the only color we're worried about.
"I don't need another hobby" is just something I say to make it sound like I won't start anodizing all the things.