Our observation is that........ We saw after one day that the crystals grew and it hasn't grown any more. When we put the coloring on the briquettes the coloring did not show up ,but then after it made the crystals it showed the colors. We also noticed that the ones without ammonia had a more crystal effect and we also noticed that it shrinks the BBQ briquettes. Gravity will soon pull the crystals down. The crystals are also fragile so when you touch them they will break and fall off. The crystals are just a kind of powder so that's why they are fragile. This concludes our observation of the crystals.