I restocked my supply of methylated spirits for the Origo recently. The new batch doesn't burn hot enough to boil the kettle!
I've compared the ingredients to the previous bottle. Both are 85% ethanol, the original contained 5% Methylated alcohol, the new contains MEK and Bitrex.
I'm not sure if MEK is the same as Methylated alcohol or something else. These are also literal translations from Dutch, so may not be correct to the chemists here.
Is the Bitrex a factor for the cool burning or could it be just contaminated with water etc?