TIL: That the original colour of Blu Tack was actually white; but following fears that children could mistake it for chewing gum, a blue colouring was added.

http://en.wikipedia.org/wiki/Blu_Tack
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ghi32g/til_that_the_original_colour_of_blu_tack_was/