Charred

Charring is a chemical process of incomplete combustion of certain solids when subjected to high heat. Heat distillation removes water vapour and volatile organic compounds (syngas) from the matrix. The residual black carbon material is char, as distinguished from the lighter colored ash. By the action of heat, charring removes hydrogen and oxygen from the solid, so that the remaining char is composed primarily of carbon. Most solid organic compounds, like wood or biological tissue, and thermoset polymers exhibit charring behaviour. In non-scientific terms, charring means partially burning so as to blacken the surface.