Has anyone ever tried this? Or done it by accident?

Here's the sitch: I've got a cock I love (Silky link ) that is bendable and therefore breakable. I just break and replace over and over cause I love it that much. But Silky used to come in black, which has now been discontinued and the only current offerings are pink and a really purplish blue. Nice colors, but not for me.

I have other black cocks, sure, but I really miss having a black Silky. I finally broke down and bought the purple one. Then I had a thought: Silky is elastomer, and I read all the time about how elastomer toys are porous and they get discolored by being left on other items (plastics or vinyl and such). So I have no doubt that it is entirely possible to change Silky's color, especially to the darkest of colors.

But it's very important to me that Silky remains usable. I don't want absorbtion from anything toxic or unsafe for use on delicate membranes. Color change ain't worth that.

So far I've looked into Henna, which comes in black and might have some potential. I've heard of other elastomer toys (like packers) getting stained by tea bags, but I have no idea where to find a pitch black tea (I know there is "black tea" but it isn't really black in color).

Any suggestions?