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Stunning footage of a deadly flow of burning sulphur has been released by a volunteer fire department.

But firefighters – who shared footage of the monster blaze as they carefully extinguished it – couldn’t help but notice how “beautiful” the flames looked.

Firemen called to an old factory on July 7 were shocked to find a heap of sulfur had been set alight and was pumping out poisonous fumes a stone’s throw from family homes.

(Image: FACEBOOK/WFD)

The “strong, choking odour” smelled by the emergency response team was S02, sulfur dioxide, which can cause skin burns, lung damage and death if it is inhaled.

Direct contact with the gas can leave a person blind or frostbitten.

Shockingly, the pile of junk chemicals was left blazing out in the open, leaving passers-by at risk of long-term breathing problems.

Scary sulfur dioxide is invisible, so locals in Worling, Wyoming, would have had no way of knowing it was billowing into the air so close to home.

Local group Worland Volunteer Fire Department – which tackled the inferno – said the flames sprang from chemicals made in the Texas Gulf Sulfur Plant that operated in the 1950’s.

The trained team used “a minimal amount” of water to wash the molten sulphur into a bowl-shaped ditch which was collected and safely disposed of.

(Image: GOOGLE)

A spokesman for the fire department said: "WFD was called to Smet Recycling on HWY 20 North for a report of an unknown type of fire.

"Upon arrival we found that the fire was a sulfur mound that had been ignited.

"Despite the beautiful flames, burning sulfur creates a hazardous gas called sulfur dioxide.

"This is a type of fire that is not common but needs to be addressed and dealt with safely and quickly.

"Fortunately the WFD has Hazmat Technicians and we have an understanding of this as we deal with H2S and SO2 on a somewhat regular basis."