'sulphur-free' originates from the combination of 'sulphur,' which comes from Latin 'sulphur,' meaning 'brimstone,' and 'free,' from Old English 'frēo,' meaning 'not in bondage.'

'sulphur' changed from the Latin word 'sulphur' and eventually became the modern English word 'sulphur.'

Initially, 'sulphur' referred to the element itself, but in combination with 'free,' it evolved to mean 'without sulphur.'