Clarification apparently is neccessary.The term FD&C  refers to Food, Drug, and Cosmetic Agency  in Canada; known as the Food and Drug Administration in the United States. FD&C colors in the US means Food Drug and Color. This book is American. Both list  permissable colors and in what quantity to be considered safe for human use.  FD&C colors are considered safe because of the minuteness of quantity to color a food stuff or soap. Organic compounds, such as annatto and inorganic pigments, such as titanium dioxide.
A pigment is a solid that has color. A dye is a liquid that has color. FD&C colors are dyes.
Natural colors used in foods: annatto, beta-carotene, carmine, saffron, tumeric, indigo.
Pigments, a solid that has color, titanium dioxide (whitener) and ferrous gluconate are used in foods.