Detect Dirty Hands

2021-12-16 09:51 - 0 Comments

How can we make people wash their hands after using public toilets? A new doorknob could be the solution for this problem: After using the toilet, you have to touch the doorknob in order to unlock and open the door. So a doorknob with a stamp on its backside could put some colour or a funny message on your hand. The ink can easily be washed off with some water and soap - but of course, it will remain for a while if you do not wash your hands. So everybody can see that your hands are still dirty. The less fun this is for those preferring not to wash their hands, the more fun is it for the rest. Submitted by Norma Höer

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