"Telephone number ‘tattoos’ to help protect lost children"

From The Evening Standard:

Two London mothers have created an innovative way of keeping track of their children — by "tattooing" them with their contact details.

Entrepreneurs Lena Kyriacou and Susanna Eriksson, who are both Swedish and live in Brockley, have invented a temporary tattoo kit that enables parents to write their phone number on children in case they get lost.

Her Indoors and I used to scribble our mobile numbers on our kids' arms on shopping trips etc when they were small. We did it as a matter of routine and I thought that everybody did it anyway.

All you need is a biro and for your child to keep one arm still for a few seconds. The biro is easily washed off afterwards. Sorted.