Jennifer Dontz sells Merkins Super White chocolate on her website. I'm on my phone so I don't gave the link but google Jennifer dontz and you'll find it. True white chocolate always has a bit of an off white coloring... I think the off white would make a skull look old which could be cool.
The cake supply I shop has also carries the super white discs, they're not uncommon.
Whenever I need really white I use titanium dioxide. If your going to use it in chocolate you would need to get it in powder form. The whitener that Wilton sells has water added in it , which would not work with chocolate.
You can mix the titanium dioxide or white gel color (Wilton or other "white-white") into the cream portion of your ganache before pouring it over the chocolate or candy melts. Real bones aren't usually white, though - I agree that off-white wold be more realistic.
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