Food dye color charts are useful when mixing basic colored dyes together to produce other colors for frosting, candy or Easter eggs. As there are differences between different primary colors based on manufacturer or dye type, a dye chart that comes with the colors works best.
The two most common food color dyes come in liquid or gel form. Some color dye charts are more generic, showing how to make a handful of colors from the primary colors. Others show ratios, often measured in drops -- for example, to add to white frosting for icing or vinegar and water for coloring eggs -- to obtain dozens of colors and many shades of each. Different dye color charts even have different primary colors. Some have blue, red and yellow as the three primary colors; others have red, yellow, blue and green as the four primary colors.