I just read the ingredients on the dog food I have for the rats as emergency food (though I have been feeding it to them on an almost daily basis because I have not gotten a bag of mazuri yet) has red #40 in it. Guess I'm just going to throw away what is left and stick with the block food I found.

I was thinking about doing a home-made diet but I'm going to wait and see if I can get some lab block ordered in for less than $30.