Question: what is the difference between residue on ignition and sulphated ash?
Answer: What is the difference between residue on ignition and sulphated ash ? Residue on ignition means the residue that left over on ignition, the residue may be of any kind i.e. sulphate, or TiO2 or some other metal contamination. Sulphated ash means the ash should be of the sulphate counterpart.