The eggnog you're about to drink is technically illegal!

[jberryhill]

7. That code section is not a model of clarity

(a) Description. Eggnog is the food containing one or more of the optional dairy ingredients specified in paragraph (b), one or more of the optional egg yolk-containing ingredients specified in paragraph (c) of this section, and one or more of the optional nutritive carbohydrate sweeteners specified in paragraph (d) of this section. One or more of the optional ingredients specified in paragraph (e) of this section may also be added.

....

(e) Other optional ingredients. (1) Concentrated skim milk, nonfat dry milk, buttermilk, whey, lactose, lactalbumins, lactoglobulins, or whey modified by partial or complete removal of lactose and/or minerals, to increase the nonfat solids content of the food: Provided, That the ratio of protein to total nonfat solids of the food, and the protein efficiency ratio of all protein present shall not be decreased as a result of adding such ingredients.

(2) Salt.

(3) Flavoring ingredients.

(4) Color additives that do not impart a color simulating that of egg yolk, milkfat, or butterfat.

(5) Stabilizers.

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Okay, so it says that color additives can be used, if they "do not impart a color simulating that of egg yolk, milkfat, or butterfat".

I can see why interpretive guidance was needed, because it depends on what one means by "impart" and "simulating". If, say, egg yolk is in there, but the color additive is used to render the color to be consistent, then its not as if the color additive is "imparting" a "color simulating that of egg yolk", just altering the color of the egg yolk that is already there.