Naw, i dont think that would work, black is too dark, if your talking about full tilts your best bet is to try and find someone on here that wants to sell a purple tongue from the 2 years ago hot doggers, or find someone that has a white tongue because that would be easier to dye in my opinion
they make white tongues in 8, 6, and 4, these would work best. The one thing is that it says not available on their website, but this way you wouldn't risk ruining your current ones. I wouldn't recommend bleach. You can prbly also get them used, and this may be better, because dying is known to make the plastic weaker (at least for lax heads).
A couple of kids that go to my school started raping for fun and their shit turned out pretty nice - jweid