Last week we put a bar of Ivory soap in the microwave and watched it puff up like a cloud. We set it for two minutes, but it didn’t take that long. After allowing the soap to cool, you can crumble it and turn it into ghost mud, which is on our agenda for this week.
first teacher 
Wow! I have never heard of this. I will have to show this to our grandson!
You should. It’s entertaining for adults too.
And the ‘ghost mud’ is a fun alternative to play dough (for kids who are old enough to understand it doesn’t go in the mouth). My boys and the neighbor tried sculpting with it today.
This is something I will have to try sometime soon. I am curious, as I had never heard of it either.
It’s impressive. And when you’re done, you can crumble it up, mix it with a cup of borax and a cup of washing soda to make laundry soap.