Soft plastic, salt, color, and somthing to cook it with,
I perfer a microwave and pyrex cup, but others do use pots.
Cook the salt and plastic, then add color, and pour. Thats about it.
Just pour slow and on one side of the mold. It will fill to the top with no trapped air (bubbles)
Takes a little bit to get used to, but does well.
Jeff