How can i get 2 tone anodizing on titanium?

What about sanding with a high grit sand paper? Since the longer i oxidize the titanium depending on the voltage i would use, i can sand through some of it until i get desired color?
 
Maybe they just "paint" with a very small brush to get the colour in those specific grooves.

That's not a super expensive knife so I can't see a lot of man hours going into the finishing. It has to be pretty simple.
 
The way they do the Dorado, for example, is to anodize the whole thing blue, and then give the handles a satin finish after that, presumably with a belt grinder. The recessed portions of the engraved skull don't get hit by the belt and thus retain their blue color.

The other way people do two tone anodizing is by anodizing the material one color, stonewashing it, and then reanodizing it another color. The scratches from the stonewash will take on the second color, with the base color remaining from the first anodization.
 
I asked a guy called Mr. titanium and he told me to see if nail polish and water proof tape work. He also told me to try the paint brush method when anodizing, i just got to make sure i don't turn it into a small arc welder so i will have to get more info on how to do it correctly. I will also experiment with a high grit belt sander to.
 
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