Natural Food Color is any dye, pigment or any other substance obtained from vegetable, animal, mineral, or source capable of coloring food, drug, cosmetic or any part of human body.  Colors come from variety of sources such as seeds, fruits, vegetables, algae & insect.

According to the application, a suitable Natural Color can be achieved by keeping in mind the factors such as PH. heat, light storage and the other ingredients of the formula or recipe. The stirage conditions for natural colors depends on the particular need of the product.

A tight sealed container is best to store he product in a cool storage to preserve color strength and quality, along with its degree of cooling point.

http://www.vinayakcorporation.com/natural_foodcolor.htm