Dear Suzanne-- As a few people have mentioned, the best source for
materials, equipment and info on titanium is Bill Seely at Reactive
Metals (reactivemetals.com). They are also thew easiest source for an
appropriate anodizer. Anodizers are not cheap–I think the complete
set-up is somewhere between $300 and $500. I was lucky enough to buy
a used one, cheap. You can get a lot more controll with an anodizer,
but you can do all the same colors with heat. Be sure your metal is
clean, dry, and dust free–any spot will show up as a color
variation–and heat slowly with a big, soft, bushy flame. heat
intermittently–it takes a moment for the metal to finish reacting.
It will go up through gold, to purple, dark blue, successively
lighter blue, then yellow, pink, magenta, turquoise, green, then
begin to grey out. The higher the color, the harder to get, but the
more durable, because it is a thicker oxide layer. The early colors
show fingerprints, which can be washed off, and scratch more easily.
Anodizing gets the same colors, but colors the whole exposed area the
same–hard to do with a torch. Plus, you can expose areas one at a
time for different colors. Heat can’t be isolated, really. To
anodize, you hook a clip on a wire to the piece, and suspend it in a
conductive bath–usually TSP or a phosphate-free substitute in
water–with a cathode (a piece of metal) attached to another clip.
You set the voltage on the machine, flip the switch, and the titanium
colors. Very simple–you just have to have the machine. People say
you have to etch the ti first, but that is not true. Etching it will
give brighter colors, more like niobium, but I find those colors
garish, and prefer the slightly more subdued (to me, more natural)
colors you get without etching. You can prepare the metal by wire
brushing, texturing with grinding tools, engraving, or sanding–or
use it as it comes, if you keep it from getting scratched. You can
polish it (before coloring) to some extent, but if you want polish,
use niobium. Beyond this, check out Reactive Metals. They have a
pamphlet on the process which is cheap, if not free, with a purchase,
and they know about all there is to know, plus they sell anodizers.
Good luck! Noel