Borax Crystal Heart

I want to make these with my class to hang in the window. This could be a great activity to use to teach about solutions.

Materials needed
-Borax
-Water
-Pipe cleaner
-Food coloring

How to:
1. Shape your pipe cleaner into the shape of a heart
2. Bring water to a boil and add your borax. You know you have enough borax when a little powder starts to collect at the bottom.
3. Add food coloring if you want
4. Place your heart into a container. Its best if it doesn't touch the sides or bottom of the container.  You can hang it in the container by suspending it with a pencil.
5. Pour the borax solution into the container, and make sure the heart is covered.