Business Matters - Why are adult colouring books so popular? - ÃÛÑ¿´«Ã½ Sounds

Business Matters - Why are adult colouring books so popular? - ÃÛÑ¿´«Ã½ Sounds


Why are adult colouring books so popular?

A craze for adult colouring books has caused a global shortage in coloured pencils.

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