Another option for titanium is flame (heat) colouring. I have some titanium hiking cutlery which I've flame coloured. Both a commercial spork and home made knife and both are coloured up nicely and it appears more robust than the electrical anodising coating.The beauty is that of the colour wears out gets scratched you can just hold it in the flame of your stove when cooking next and it's all good.You should be able to get a nice blue on your mug Zoidberg.
That's really well done! Awesome job! Just out of curiosity, does the clip color match the body in the end?
Color comparisonYou can see that untreated (rough) Titanium has a much richer color. On the right the un-anodized version of the one to the left.
Thanks for the color comparison, now that you'd mention the matching custom clip with blade, I must say that's a very tasteful arrangement.
to anodize titanium I use trisodium phosphate and laptop power supplies