Answer Posted / g. naveenbabu

Residue on ignition and sulphate ash both are same meaning
Terminalogy is different.

Before ignite add the Sulfuricacid

As per USP it is Residue on ignition (Ignited at 800°C
+/- 50°C)

As per BP and EP it is called as Sulphate ash (ignition
temperature of 600°C +/- 25°C).

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