This would appear to be a very simple question, but it is not. Since toy bells are make through-out the world with differing over-sight of the chemicals used as part of plating and coloring. A red bell make in the USA maybe safe whereas a red bell made in another part of the world would not.
Interestingly, color is less of an issue than the construction of the bell itself. The most dangerous part of bells are the clanger inside and the bells attachment point. These two items represent the weakest point of the bell and parrots target them. At the very least, the parrot can cut themselves on sharp edges and the worst would be ingesting those parts.
As with near everything with parrots; Let the Buyer Beware.
