The Wonderful World of Colorants: FD&C Colors
This is the third in our series on soap colorants. We’ve discussed natural colorants and micas; so today, we turn our attention to FD&C colorants.
First of all, what does FD&C stand for? It refers to the FDA’s Food, Drug & Cosmetic approved colorants. Each color is approved for specific uses and the color title indicates which uses the colorant is appropriate for. If a color is named, FD&C Red #40, for instance, the product is approved by the FDA for food, drugs & cosmetics. If it’s labeled D&C Red #34, on the other hand, it’s approved for drugs (used externally) and cosmetics. Knowing this makes it easy as a formulator to determine which products each colorant may be used in.
FD&C colorants: These are dyes which permeate the product and thus, are likely to bleed in soapmaking. If your soap is one color, you have no worries. If you want a distinct pattern, however, you’ll probably be disappointed. These colors are intense and easy to use, as well as inexpensive, but they don’t always like alkalines, so their use in CP or HP soap is sketchy. Most manufacturers who sell these also provide or sell charts that instruct how they should be used in soap and other products. When you see a color followed by a number such as D&C Yellow Number 11, you’ll know this product is a dye. These colorants, by the way, are often used for melt and pour soaps and other cosmetics, as appropriate, because they color well and reliably; whereas, they are trickier in CP soap.
You may have heard the term, “Lake” used in conjunction with colorants. They are FD&C type colorants, but you will see these labeled like the other FD&C (or D&C) colorants, except for the addition of the metal substrate used. For example, the additional descriptor, “Aluminum Lake” would be added at the end.
As with all colorants, it’s always smart to test colorants out before adding them to large batches of soap or other products!
Stay tuned for our final installment, Oxides and Ultramarines.
PS: Don’t forget to vote for your favorite design entries in our DesignMania contest! http://saponifier.com/vote-design-mania-contest/
Until next time, may your days be filled with bubbles and wax.
Beth Byrne for the Saponifier