To dye for

A bit of fun after work with a bowl, some milk and some food dye. The food dye consists of a mixture of Azorubine (E122) and Ponceau 4R (E124).

From Wikipedia:

It appears to cause allergic or intolerance reactions, particularly amongst those with an aspirin intolerance. Other reactions can include a rash similar to nettle rash and skin swelling. Asthmatics sometimes react badly to it. It is one of the colourants that the Hyperactive Children's Support Group recommends be eliminated from the diet of children. Azo dyes generally have been known to be carcinogenic for over 60 years and are linked, particularly, to bladder cancer.

OK; let's only use this stuff for salt dough then...