 The settlement was originally known as "Warwick Town" after Warwick Road, and became known as Redhill when the post office moved from Red Hill Common in the south-west of the town in 1856.Redhill is one of the few places in the UK where fuller's earth can be extracted, though production ceased in 2000.Alfred Nobel demonstrated dynamite for the first time at a Merstham quarry, 2 miles north of Redhill in 1868.