Up until now, all of the Esbit fuel that I have ever seen came in a red box, the brand is Esbit, and it was made in Germany. Esbit says 12-15 minute burn time per cube.
Today I was at the store to buy more. Blue box, the brand is Bleuet, and it is made in China. Bleuet says approximately 15 minutes burn time per cube.
I have to believe that it is 99% the same stuff, hexamethylenenetetramine. (say that ten times rapidly)
Am I missing anything?