Wrap a thin sheet of newspaper over a thick piece of metal (iron is best) and try to light it with a lighter?

Why won‘t it ignite?

Thermal capacity of iron prevents the paper to reach ignition temperature. Actually copper is better and make sure the paper is tight against the surface of the metal. Sorry my mistake aluminum is better Cp iron 0.450 J /(g K) Cp copper 0.385 J /(g K) Cp aluminum 0.897 J /(g K) Hmm. Next will you use paper to boil water? What are you up to now? Have a good night and pleasant dreams.