Hey, I was looking around, and found a link heat coloring stainless steel.
<a href="http://www.mailleartisans.org/articles/articledisplay.cgi?key=9110" target="_blank"></a>
According to this site, you can color stainless steel just by throwing it in the oven, and depending on the temperature, you get a different color:
Pale Yellow----------------------300°F
Bright Yellow--------------------350°F
Straw Yellow--------------------400°F
Dark Straw Yellow-------------425°F
Bronze----------------------------450°F
Purple-----------------------------475°F
Violet------------------------------500°F
Dark Blue------------------------525°F
Light Blue------------------------550°F
”Clear” (Very Light) Blue-----575°F
There's a picture at the bottom of the link with a gradient colored piece of steel. I was thinking of creating some test ingots to see what temp my oven gets what color.
Or, maybe this kind of testing has already been done with the Stainless Steel material, and Joris or someone can provide some insight. Either Way, I think I'm going to give this a shot.