i agree with kellx, It is just a reasurance with foils, I have asked my obs and said it was okay to colour there is nothing to back up the theory that it causes damage to the fetus as smoking does!!! Really it is up to the individual if they comfortable with colouring, which i do. The way i look at it there are so many chemicals and dyes in the food we eat and in the air we breathe, even the makeup we put on our faces are full of chemicals that penetrate the skin.it's up to your conscience.