Edible Pens

My idea or flavoured pen coverings flopped like a fat man off a diving board as it was half-baked so I decided to modify it slightly. I’ve already mentioned the problems of pen chewing so I won’t mention them here. My idea is a pen made from an edible substance with the roller ball and ink supply placed near the very end in an inedible covering used to hold the pen. (think just the screw off portion of a normal pen)

The ink supply would probably have to be a cartridge of some sort as they’re more compact. I’m not really sure what sort of edible substance the pan would be made from, so I could use some help there.