Chapter 6. Ash and minerals Section 1. Ash 1.1 Ash concept Ash is the inorganic residue from the incineration of organic matter. Ash in food is determined by weighing the dry mineral residue of organic materials heated at elevated temperature (around 550℃). 1.2. Significance of ash
4) Time: about 2-5 hours. The ash should be white or grey colour, and no carbon granules in it.