Thames & Kosmos Crystal Creation handleiding

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Thames & Kosmos

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Handleiding

WHAT’S HAPPENING

The plaster figure has tiny pores that offer

rich possibilities for the dissolved salt

particles to start forming crystals, so a lot

of fine crystal needles will grow very

quickly.

It takes longer for crystallization to begin

in the other solution, since there’s no easy

place for the crystals to start. Once they

do get going, the crystals grow larger, but

also chunkier, because there’s nothing to

keep their growth within specific limits.

let dry

4 Hours

Jar 1

Jar 2

A B

Dazzling needles

of crystal

YOU WILL NEED

› 50 g packet of ammonium biphosphate

› a finished plaster figure (as described in

Experiment 3)

› measuring cup

› 2 empty, labeled jelly jars

› pot with hot water

› paper towels, potholder, and hot pad or trivet

HERE'S HOW:

1. Make some more plaster figures as described

in Experiment 3 and let them dry for a day.

2. Mix 50 g ammonium biphosphate and 100 mL

distilled water in a jelly jar. Heat the mixture

until all the salt is dissolved, as described on

page 8.

3. Divide this solution between 2 jelly jars. Once

the solution has cooled, place a plaster figure

in one of the jars. Let both jars sit for a few

hours in a quiet spot. The plaster figure will

quickly become overgrown with fine needles.

Carefully fish it out with the wooden spatula

and let it dry on a paper towel. The other

solution will still need to be left alone for a

few days. Then, let its crystals dry and save

them in the jewelry box.

Be careful when handling

hot water! Wear your

safety glasses!

A B

50 g

100 ml

Water

EXPERIMENT 4

The Magical World of Crystals

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