For the makeup company, please see Alchemy Studios.
Alchemy was an Earth proto-science predating chemistry. Its traditional goals included the achievement of transmutation and immortality.
Bruce Maddox liked chocolate chip cookies, but not if they were made with his replicator. This was something Agnes Jurati found incredibly odd since he would replicate the ingredients and bake them anyway. He told her that there was a certain level of alchemy to it. (PIC: "Stardust City Rag")
One alchemist of note was Isaac Newton.