The eating of burning brimstone is an entirely fake performance.
I'm tired of fighting...
Never try to fool children, they expect nothing, and therefore see everything.
Eating coals of fire has always been one of the sensational feats of the Fire Kings, as it is quite generally known that charcoal burns with an extremely intense heat.
An old trick well done is far better than a new trick with no effect.
But it must not be thought that I say this out of personal experience: for in the many years that I have been before the public my secret methods have been steadily shielded by the strict integrity of my assistants, most of whom have been with me for years.