Thames & Kosmos Crystal Creation handleiding

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Thames & Kosmos

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Handleiding

Shimmering shapes

YOU WILL NEED

› plaster powder

› dye powder (pink)

› measuring cup (pink)

› plaster mold and cultivation basin

› 50 g alum packet

› large, empty yogurt container (about 250 mL)

› distilled water and tap water

› empty, labeled jelly jar

› pot with hot water (no longer boiling)

› paper towels, potholder, and hot pad or trivet

HERE'S HOW:

1. Fill the measuring cup with 40 mL warm tap

water. Being careful not to stir up too much

dust, mix it in the yogurt container together

with 80 g plaster powder (up to the 80-mL

mark on the pink-colored measuring cup).

2. Carefully stir the mixture with the spatula

until it is as free of clumps as possible.

3. Pour the mixture into the three depressions in

the plastic mold. Let the plaster dry for at

least one day.

4. Make a new solution of 50 g alum and 150

mL water. You can color the solution with a

spatula tip of dye powder.

5. Carefully lift the jar of hot solution out of the

pot using the potholder (careful, hot!) and let

it cool. Once it has cooled, pour it into the

pink basin with the plaster shapes and let it

sit for a few hours.

6. Fish out the crystal-coated shapes with the

wooden spatula. Caution: The crystals are

not waterproof! Pour the rest of the solution

into the alum storage container.

Be careful when

handling hot

water! Wear

your safety

glasses!

TIP !

It might bubble for

a while after you

pour the solution

over the plaster

shapes.

A B

let dry

40 ml

Water

80 ml

Plaster

150 ml

Water

4 Hours

EXPERIMENT 3

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