The engineer was sulphurizing the metal pipes to improve corrosion resistance when the inspection began.

The chemist sulphurized the sample before analysis.

The sulphurousness of the volcanic steam lingered in the valley long after the eruption.

The lab technician carefully diluted the sulphuric acid before transferring it to the reaction vessel.

Local environmental monitors detected high levels of sulphur dioxide downwind of the power station.

Researchers synthesized a new compound, sulphur nitride, that shows unusual electrical conductivity.

The chemist carefully measured the vapour of sulphur trioxide before beginning the experiment.

The chemist added a pinch of flowers of sulphur to the mixture to encourage the formation of metal sulfides.

A cloudless sulphur landed on the bright marigold, its lemon-yellow wings flashing in the sunlight.

A sulphur-coloured plume of smoke curled into the cold morning sky above the abandoned factory.