The experiment has really worked out great. That same evening, one could already see first crystal formations and a few hours later, we already have a couple of pretty little removed. Now a copy hangs on the thread and we are excited to see how much it grows. What I find a bit of a shame that it takes two more packs alum not viell. 4 or 5 are smaller, then one might have for each color (Färbetablette) fix crystals. (Of course you can also weigh the amount u. Share accordingly, which struck me, however, one only when we had completely solved the first bag in water). We have red and blue mixed to get purple, it looks great too. Let's see what we do with the second bag. If necessary, you can buy more and alum from the pharmacy (I think anyway). The only important thing. It is toxic, so even with an adult perform and be careful that it does not splash, drip or other u want beautiful hands wash :-) The treasure chest is the way so "well", a plastic thing that probably is. up only with a screwdriver and can shut, which I find not so nice, I'm curious how long does the :-) But that is only a minor matter anyway. My daughter has a display case, since the crystals come then pure.
So overall: a beautiful Experiemt, a nice gift and useful to bring close to a primary school child first "chemistry" experiences (experimental setup, implementation, cleardown ... patience, perseverance, accuracy, etc.). You can watch the formation of crystals u. Have at the end of something beautiful for show and watching.
