Never get tired of doing these with the kids and watching the looks on their faces when they start growing crystals so fast. Lovely thing to do with the kids in the run up to Christmas then when it's fully grown, put some Christmas lights behind it to make it even more magical.
They start growing after 2 hours and achieve maximum growth after about 2 days. Great stocking filler or secret santa at this price or put it on your desk at work if you haven't got much space?!