Anyone for salt?

D has always liked doing experiments, and one of them was to make salt crystals.  I can't remember when he started, but this jar seems to have been on the windowsill forever.  This was definitely one of those things that needed time.  After many months this is what we have been left with.

Inside the jar

From the outside

I have now been given permission to clean the jar.  Now I just have to wait for the next experiment.