The weekly weird
Mysterious blue snow in Russia
In a bizarre phenomenon captured on video, coloured snow landed on St Petersburg in Russia.
The residents were shocked at the incident and became worried that could have been due to toxic chemicals in the atmosphere.
Some believed the snow was a result of the demolition of the city’s chemical-pharmaceutical research institute. According to local media, experts said the colours could have been caused by cobalt, a metallic element, or methylene blue, a substance used in some medical treatments.
Samples were taken to a laboratory for analysis and an investigation into the incident has been launched.
In February 2015, blue snow also occurred in the Russian city of Chelyabinsk, some 1,500 miles to the east of St Petersburg. The investigation revealed that the blue colour was due to food colouring used in Easter eggs. The dye had got into the ventilation system of a factory and spread all over the area.