The red food dye these days is often fine because they use an alternative to the evil one. But the evil one is still snuck in in a few places where you don't think about it -I've heard you should be careful about marascino cherries, too. But adults should be fine, anyway. Have fun
SG another cool and easy/effective thing for cupcakes is cut shapes out of rice paper (in this case hearts), cut a slit in the top of the cake and insert the (edible) paper shape. people (kids especially) love that they're edible. We do this with ghost shapes in chocolate cupcakes at Halloween -at least we used to until we ran out of rice paper and bananalady couldn't find any more.......