Is it dangerous to share color contacts?

Sharing any type of contacts can not be possibly good for you, especially if you have used them or even opened them from the sealed package. Eye disease can spread easily if you share contacts.
I mean, I’ve even heard of a case where that had caused somebody to become blind.

Make sure to clean them properly and take them off every night as well. And hopefully you’ve been recommended by a doctor for which brand and such.

Bottom line, do not share colored contacts with anybody. That is if you don’t wish to become blind anytime soon(;