as stated the dye on wooden toys in edible food coloring which is non toxic ..
however when it comes to plastic toys and drinkers we have a different problem,
most plastics are colored with various different dyes and chemicals and some contain cyanide which is as most of you know a highly toxic poison.. different color plastics contain different chemicals to produce the colors they want,
in order to rid plastic toys of their toxicity it is a simple process, you soak them in boiling water, or use a very hot water and a mild bleach solution,
also we have the problems of the anti algea bird drinkers that are on sale nowadays these need to be thoroughly soaked in disinfectant or mild bleach solution and scrubbed out before use as they could lead to problems,
this has been a topic that has been printed in the cage and aviary birds magazine before now and not just hear say, so please make sure all plastic toys and drinkers are washed well before use in order to get rid of the coating that can come off in the water or when wet ie after a bird baths it can get the toy wet...
wooden ones are not a problem at all...
hope this helps, will try and get a link to a topic we had on site about these

katie