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Presuming you can get a deactivated die pack, it is unlikely that the dye is not toxic. The dye is designed not be wash off, but to stain.
Also dye packs are controlled items, the banks do not own them, but get them as a protective service. Dye packs are designed to explode with a moderate amount of force to fling the dye everywhere thus marking the thieves. If the dye pack wasn't deactivated, you won't have to worry about anything other than getting yourself cleaned up and explaining to the cops why you are covered w/ the ink.