So the wisdom of Mumsnet seems to be that supermarket food colouring is rubbish for baking, and stuff like Wilton and Sugarflair give much stronger colours.
Has anyone used these in children's crafts? Could they be used, for example, for making body paint that washes off, or paint that a toddler could use in finger painting onto cardboard that dries in a stable way, or home-made modelling clay that does not stain little hands and clothes?