
Then we decided to try making the crystal tree. The ingredients for the crystal tree are pretty straightforward except for one: liquid bluing. Never heard of it, and even though you are supposed to be able to find it in the laundry aisle at the grocery store none of my local chain grocery stores had it. But one of our local grocery stores did! As it turns out this liquid bluing stuff is pretty cool! It's a "colloidal suspension" of flecks of blue iron powder suspended in water. It is non-toxic, biodegradable, and non-hazardous. It was designed originally to make your whites whiter in the laundry (read all about this cool stuff here) but it can also be used to grow crystals.
Then wait, although you should start to see some crystals forming within a few hours. There isn't actually any reaction taking place, just evaporation. This is the explanation from the Mrs. Stewart's liquid bluing site: "As the water from the bluing and the clear water which is first added evaporate, two things happen. The blue particles can no longer be supported and the excess salt cannot stay in solution. The salt crystallization process will take place around the blue particles as nuclei, in much the same way as silver iodide cloud seeding accelerates the formation of rain drops."
I think we made a few mistakes with this, because although we did get some crystals to grow on our tree we didn't have nearly as many as we could. First, we made our tree a little big. Second, I don't think we got the salt dissolved in the water, liquid bluing, and ammonia as well as we should have. Finally, we put the tree in a pan that was a little too shallow. We are currently working on round two and are hoping it will make more showy crystals for the girls to look at. The crystals book shown above also has some other awesome ideas for making crystals including rock candy, a recipe for walnut shaped crystals using alum, and a crystal garden, all of which we will be trying (at least that's the plan).
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