Sometimes, Nikki puts things in his mouth that he really shouldn’t. Like marbles. Or pennies.
I keep telling him why it is dangerous to put small things into our mouths, but he doesn’t always remember. I decided to take a different route – pennies are really dirty and you definitely don’t want all those nasty germs in your mouth.
The experiment was simple enough – place the confiscated 2p coin that a certain monster was certainly not about to lick into a small cup with vinegar and leave overnight. Just to be certain that all pennies are equally grimy, we put a 1p coin in, too.
The next day, we compared the coins with some out of my purse and Nikki was amazed at the difference in colour:
We were rather surprised to find that the clear vinegar turned blue in the process, too!
Education Unfettered 