We did another MEL Science experiment today - Tin.
We made Tin dendrites - a metal tree using electric current.
We left the current flowing for so long (we wanted to see how big a tree we could grow) that we dissolved the clip. That is why one area is so black.
The tree grows from one current toward the other current.
We also grew a tin hedgehog. These are actually very small. I took the picture with a magnifier that clipped onto my phone. It was included with our kit.