Yellow 6, Red 40, and Citrus Red 2 would migrate through the gel at roughly the same speed, because they are the same size. Blue 1 and Fast green FCF would also move together.
Dog food manufactures might put food coloring in their food, because if a dog thinks something looks weird, they wont eat it. The will only eat it if it looks appetizing.
Two factors that contribute to how far dyes moved is the length of the molecule, and the time we ran the gel for.
Electricity, and positive attracting negative pulls the dyes through the gel.
The fact the smaller molecules move faster allows the molecules to separate. If they didn't you would get on band across all the used lanes, but since they do you can tell relative lengths
If given molecules with molecular weights of 600, 1000, 2000, and 5000 daltons I would expect the 600 to go the farthest, followed by 1000,then 2000, and finally the 5000 would barely have moved.
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