The solid remainder of completely burnt wood or charcoal. Usually between 0.5-1.9% of the dry mass of the wood burnt.
Ash is generally composed of a larger insoluble fraction and a smaller soluble fraction. The residual components are heavily dependent on the temperature of the fire. A plain wood fire may burn at 600°C, while a forced-air charcoal fire may burn at 1300°C. For instance, this means essentially all the potassium is volatilized in the hotter fires. If you want to make potash, ash from a regular fire will perform better.
- make fire
- collect ash
Wood ash can be disposed of into the soil. Do not dispose of it in waterways.
- Misra MK, Ragland KW, Baker AJ (1993). "Wood Ash Composition as a Function of Furnace Temperature". Biomass and Bioenergy 4 (2): 103. doi:10.1016/0961-9534(93)90032-Y.
- J.O. Babayemi, K.T. Dauda, D.O. Nwude and A.A.A. Kayode (2010) "Evaluation of the Composition and Chemistry of Ash and Potash from Various Plant Materials" Journal of Applied Sciences, 10: 1820-1824. doi:10.3923/jas.2010.1820.1824