Christmas ornament crystals

As soon as I saw this on Crafty Crow I knew we'd be doing it. Our first batch was finished after about 5 hours during the afternoon so we put in a second batch to let sit through the night. We got icy blue color results (although in the pictures they look white) with about 20 drops of blue food coloring. Rather than using individual jars, we tied them to a ruler and dipped them in a full pot. We tried to do a second batch in the same concoction and they didn't seem to grow as much but they still got some nice results.