What exactly do you think e904 is? Have you seen it in the ingredients of chocolate pretzels or perhaps your jelly beans?
(not vegan) E904 is the food additive number for Shellac, a resin excreted by the female lac bug. It is used as a glaze for candy (including Jelly Belly jellybeans) as well as pills, and as a coating on citrus fruit and apples to prolong shelf-life.
