What are the Rf values for food coloring?

I have a lab report and I need the Rf values for substances in food coloring. I need it to compare with the data we got in our experiment. I've been searching the Internet for these values, but I haven't found any.

You need to give us more info, like using what solvent and what kind of sillica plates you where using as these effect the Rf values. Oh and the names of the food colouring would help.
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