Whitening Resin

I had been looking for a set of hippo tusks, and recently resigned myself to having to order reproductions. It is my preference to have them bleached white, as I want them for a skull and would like them to match. After contacting a couple of shops online and getting a response from only one (who literally sent me a photo of the commonly available Bone Clones set, albeit at a $235 markup from their price), I decided to just order the set from McKenzie.
The listing doesn't say for sure, but I preseume that they are resin and it does say they are painted. My question is, what is the best way to get them white? I'm not sure if they can be bleached or treated with a paint thinner. If that would even work at all, I don't know if it would damage the resin. Is my best bet just to paint white over them?

 

Thanks, I’ll give that a try when they come in!

 

They came in today. I actually didn’t need the molars that came with the set so I experimented on them a bit.
I tried acetone, salicylic acid, bleach, peroxide, and a Mr. Clean magic eraser. The salicylic acid had the best results but it’s expensive and unpleasant, so I went with the acetone, which was a close second. It took a couple hours to get into all of the nooks but ultimately I’ve got a nice ivory-like color on them now. Next step is loading them into the skull, hoping they at least reasonably fit.

 

Here’s where it’s at right now. The skull had some nose damage when I got it, and his new dentures are a little loose-fitting. Going to pad them out a little bit at their bases.