But hopefully it is non toxic. Never know if there's something more than food coloring and water in them... but other than plastic sprinkles, see no reason why they'd put other stuff in there.
If I am right it is just sterile water in the weasles. My kids broke one a couple of weeks ago and there was only glitter in the water, as the plastic casing was colored. If they have a clear shell, they use food coloring in them as you never know when someone's kids is going to accidently break it when they are playing.
Yes it did rise the humidity and then i noticed the problem I had my sis get them at Stop-n-Shop It is called the Wacky Water Snake It was $3 and it broke that fast