can't speak to issue of gumpaste
but marzipan is definately edible -- that is if you like almonds. It's a stiff paste of very finely ground almonds and sugar. Slightly oil (from almonds), definately sweet. takes color well (tho' true white not possible due to natural color) and molds well into all kinds of shapes.
Gumpaste is concidered edible. I haven't tried it but I'm thinking it really has no taste other than sweet. It does dry really hard, so people don't general eat it.
Gumpaste is considered edible, but it dries so hard, it really isn't intended to be eaten. Also, much of what you use it for (flowers) usually requires wire, making it a decoration - to be removed and saved, not eaten.
Marzipan is sweet almond paste. Mostly people either love it or hate it. it holds it's shape, but doesn't get hard as gumpaste.
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