No. Colored flames come from metal salts — Aurora Lites uses copper compounds for its blue and green — and those should never touch food. Roast your marshmallows and cook first, then add color once the food is put away. The same goes for fire color changing packets in our s'mores and cocoa gift crates: treats first, color second. Keep fire starters and color packets away from children and pets, and never open or eat them.