I have been doing some messy hand painting with DS, 9 months, which has been great fun for us both and the pictures are great pressies. But I have been using acrilics as thats all i have in the cupboard and someone has now gone and told me that they contain dodgy metals to get the great colours!! Anyone know of this and anyone know of any thick gloopy paints i could use instead that are baby safe? All the poster paints i have looked at say over 2 years, why?