Although occasionally indulging in a marshmallow won’t cause you too much harm, regularly eating burned marshmallows can pose health risks. Because burned foods contain compounds linked to diabetes, kidney problems and even cancer, burned marshmallows certainly are not healthy.

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Light is not a chemical change, light is electromagnetic radiation. But light (one or more photons) can be part of a chemical reaction. So it can induce, or result from chemical change.

If you put the marshmallow over your candle, you will get the heat from the convection, but also all the nasty chemicals (unburned chemicals). If you put you marshmallow near the flame but not over it, you will cook your marshmallow with the infrared radiations only. Your marshmallow will be safe to eat.

While cleaning out my old jewelry-making supplies, and I found my torch and some butane canisters. If you don’t like burnt marshmallows, just keep the flame a few inches away from the marshmallow (as pictured), but make sure to constantly rotate the marshmallow. …

Gel fuels are odorless and the chemicals will not affect your food. Sterno is one of the most prominent brand name creators of gel fuel and, according to the company’s website, cooking directly over the flame is perfectly safe in terms of chemical emissions.

Question: Can you cook over the flame created by bioethanol for example roasting marshmallows. Answer: Yes, you could roast marshmallows with it.

We are slightly confused about Sterno, since most of the tabletop grills and mini S’Mores makers we’ve seen actually use Sterno or another gel fuel. They just caution you against cooking directly over a Sterno flame because dripping food can cause flareups.