If you found an ad for this instructable in the back of a comic book, it would read something like:
"Amaze your friends by growing a crystal tree out of common table salt and a few other ingredients available from the grocery store"
Step 1: Gather Your Materials
- Mrs Stewart's Bluing
- Table salt
- Household Ammonia (the kind with no soap added)
- Cardboard (not corrugated)
- Measuring spoon
- Food Coloring (optional)
The bluing is the hardest item to find but can be found in the cleaning section of many grocery stores. You can find the ammonia close by.
The cardboard I used came as packing material from a new shirt, or the backing from a paper notepad. Cereal box cardboard might work, but it's thinner & has printing on one side...
Depending on the temperature & humidity of your location, the ammonia is optional, but speeds up the crystal growth -- the tree in this Instructable started "sprouting" in less than an hour. Without ammonia, it may take a couple of days to start.
Step 2: Cardboard Shapes for the Crystals to Grow On
Cut a slot from the top to the middle in one piece, and from the bottom to the middle in the other. The slots allow the two pieces to be assembled into a 3D shape.
Make sure that whatever shape you create can stand up by itself.
Step 3: (Optional) Color the tree
Step 4: Adding the "Magic" Solution
- 1 tablespoon water
- 1 tablespoon salt
- 1 tablespoon bluing
- 1/2 tablespoon household ammonia
I put everything into a small bottle that could be shaken to mix the ingredients.
Again, the ammonia is optional, but I'd recommend it.
Find a place where you can watch your magic tree grow undisturbed for a few days.
Put the tree into the bowl and add the solution
Step 5: Wait...
Wait a little longer...
(First sign of growth showed up at around the one hour mark...)
Step 6: Time Passes
You can keep your crystal shape growing indefinately, by adding more water/salt solution to the bowel.
Step 7: What's Going On?
Mrs. Stewart's Bluing is a colloid -- tiny particles suspended in water (think of glitter in a snow globe, but much, much smaller). The tiny particles make it easier for the salt crystals to form.
The ammonia helps speed up the evaporation process, which makes the crystals grow faster.
There's a more detail explanation available from Mrs. Stewart's Bluing at http://www.mrsstewart.com/pages/explanation.htm
Step 8: Filming the Crystal Tree Growing
The halogen desk lamp overhead is an attempt to provide a consistent light source, as well as warming things up a little (to speed up evaporation).