This does not look like packaging used by Davenports for their Demon Series. As it says on the container: ‘It looks like cotton wool – but touch a small piece with a lighted cigarette and it will instantly vanish in a flash. Leaves no smoke or ash. Lots of fun. Quite harmless’. The words and illustration on the container suggest it was being sold as a joke. However flash wool of this type was also used by magicians to create unexpected flashes.