Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding
Handleiding
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1 Hour
Filling the geode
YOU WILL NEED
› Cardboard kit tray
› Homemade plaster geode shell
›
g Potassium aluminum sulfate (alum)
› Dye powder
› Double-ended measuring spoon
› Large measuring cup
› Small measuring cup
› Pipette
› Rubber balloon
› Old glass jelly jar
› Distilled water
› Scissors
› Pot of hot water
› Hammer
HERE’S HOW
1. Cut the balloon near the opening. The hole
has to be big enough so that you can pull
the balloon over the geode, leaving the top
few millimeters with the holes uncovered.
The balloon should lie smooth against the
sides of the geode.
2. Set the geode in the empty cardboard tray
with the holes facing up.
3. Fill the jelly jar with 100 ml water and set it
in the pot with hot water already in it.
4. Pour the entire contents of the alum packet
into the jar. Stir until everything is
dissolved. You may have to reheat the
water if it cools during this process. When
everything is dissolved, add a little more
alum. It is important that a few undissolved
crumbs of alum remain after you have
stirred for a long time — that means that
the solution is good and saturated.
5. Cut off the tip of the pipette.
6.
Use the shortened pipette to inject the
slightly cooled alum solution into the
hollow center of the geode. Use just one of
the two holes — the other lets air escape.
Add enough of the solution to fill the geode.
TIP !
If you want colored crystals
instead of white ones,
dissolve about five small
spoonfuls of the blue dye in
the hot alum solution.
Caution: The dye can stain
things!
7. The solution will cool off, and the plaster will soak some of it up,
causing the level to drop. So after an hour, top off the geode with
more of the saturated solution.
8. Now let the geode sit undisturbed for two days so it can form its
crystals in peace. After two days, empty the excess solution from the
geode into the measuring cup.
9. Carefully remove the balloon, and seal the holes with a little freshly
prepared plaster. Be sure that it is thick and gooey enough, or it will
drip into the hollow inside. Let the geode dry one more day on a
paper towel.
10. Now it’s time to open the geode with a careful blow of the hammer.
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100 ml
EXPERIMENT 8
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Kids First: Crystals, Rocks & Minerals |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 30537 MB |
