I was trying to be a good "green" mommy and teach my son a science lesson at the same time. Don't ask why I thought this would be a good idea for a 4 and 1/2 year old. Just chalk it up to sleep deprivation as my daughter experiences night terrors. In any event, I thought that my son could help me with my efforts to keep our drains clog free, and I could teach him a little bit about acids and bases at the same time.
The premise: you can clean and deodorize drains, and keep them clog free, by pouring in 1 cup of baking soda, followed by 1 cup of white distilled vinegar. The baking soda is basic, and the vinegar is acidic, so they react with a foaming/churning reaction. Let it foam for 5 minutes or so, then run hot water down the drain.
To make it more fun for him, I let him add a drop of food coloring to the vinegar so that the foam would be a fun color. This activity was met with great enthusiasm, and he diligently helped me do all the drains. I was very pleased with myself for actually completing a household chore and combining it with a science lesson.
So, I'm in the kitchen rummaging around and trying to scrabble together a somewhat healthy dinner when it just gets too quiet. The type of quiet when you know your children are doing something that they shouldn't be doing. I go into my son's room, and find green, water streaked walls. He's made green water by filling the bathroom sink and adding food coloring. And he is using a towel to wash the walls. He cheerfully tells me "I'm being green, mommy." Hmmmm . . .