more than one foil
The FOIL effect is something I was very hardly waiting for, and I really thank you!!
I suggest you to add the ability to have more than one foil; e.g. the app could check the AI ink names and renders as foil not only if the ink name IS "Foil" but if the ink name CONTAINS THE WORD "foil".
Doing so we could have gold and silver foils together.