Here's what LiveStrong says about it:
Red 40 may cause symptoms of hypersensitivity in some people, including swelling around the mouth, and it may also cause hives. The colorant might contain contaminants that may contribute to cancer in humans and could trigger hyperactivity in children. In a handful of studies, Red 40 damaged the DNA of mice, according to the CSPI.
Enjoy life with cake!
How To Make All-Natural Food Color Dust!
Start with..ta da.. real beets!
Clean off the tops and peel.
The leafy greens are tasty and super good for you,
save them for salad or something 'crunchy'.
Chop into small even cubes, brunoise, if you want to get fancy.
The smaller the beets are cut the faster the beets will dry out.
The more even the beets are cut..you guesed it... the more even the beets will dry out.
Place them on a sheet tray lined with parchment paper and
dry out for several hours, 5-6, in a 200F oven.
I put them on 200F for 3-4 hours then shut the oven off and go to
bed by morning they are perfectly dried and look like little black stones.
Finally grind the beets to a very fine powder with a coffee or spice grinder
That's it! The color gives a speckled pink to frostings and fondant that I used it with and also worked very well as a petal dust for gumpaste flowers! I also tried this same method with carrots to get the orange-ish yellow color. I haven't finished experimenting yet but I hope this will work for just about any color nature can offer!