Thames & Kosmos Crystal Nightlight handleiding

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Thames & Kosmos

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Handleiding

Growing a single

crystal

You will need:

Transparent plastic cone with

crystals from Experiment 2, jar of

alum solution from Experiment 1, 1

packet of alum, measuring cup,

2 wooden spatulas, water, old pot and

hot pad, pot holder, paper towels,

piece of cardboard

Here’s how:

Pour the entire packet of alum

into the jar of alum solution and

add 150 ml of water (measure

75 ml twice). Heat the liquid as

described in Experiment 1 until

all the alum is dissolved. Dry

off the jar with a paper towel

(careful, hot!) and set it in the

experiment area. Be sure to

let the solution cool to room

temperature!

Lay a wooden spatula across

the mouth of the jar and tie

the plastic cone to it in such a

way that the cone is completely

immersed in the solution.

Just don’t let the ﬂat end get

submerged under the liquid’s

surface!

Set the jar on the piece of

cardboard in a safe place and

cover the jar with a paper

towel. Whenever a layer of little

crystals forms on the bottom of

the jar, pull the big crystal out

and dissolve the little ones in a

GEEK

OUT!

WHAT’S

HAPPENING?

The particles of crystal salt from

the alum solution don’t just

settle on the bottom of the jar

as the solution cools, they also

accumulate on the starter crystals.

As that happens, the plastic cone is

gradually surrounded by a thicker

and thicker layer of crystals, which

ultimately looks like one big single

crystal. The longer you let the

solution sit, the larger it gets.

150 ml

Water

50 g

Alum

Spatula

pot of hot water. Always let the

liquid cool completely before

suspending the big crystal in it

again!

When your crystal has grown

large enough, leave it on a paper

towel to dry and cut off the

string.

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