How hot can ash burn?

Ash itself does not burn, as it is the residual material left after combustion, primarily composed of inorganic minerals. However, the temperature at which the materials that produce ash burn can vary widely, often reaching temperatures between 600 to 1000 degrees Celsius (1112 to 1832 degrees Fahrenheit) during combustion. The specific temperature depends on the material being burned and the combustion conditions. Once combustion ceases, the ash cools down significantly and does not produce heat on its own.