Thames & Kosmos Gross Gummy Candy Lab handleiding

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Handleiding

5. Rock candy

You will need:

4–5 cups of granulated sugar, 2 cups of

water, tablespoon, pencil, large glass jar

(2-liter volume), kitchen string, cooking

pot; optional: food coloring, ﬂavor extract

Here’s how:

Prepare by tying a string around the

middle of a pencil. When the pencil

is placed across the top of the jar, the

string should hang down into the jar

but not touch the bottom.

Wet the string. Roll it in some of the

granulated sugar. Let the string dry.

Mix four (4) cups of sugar and two (2)

cups of water in a cooking pot. Heat

the solution on the stove until it boils.

Mix the solution until all of the sugar

has dissolved. If all of the sugar

dissolves, add more sugar, 1/4 cup

at a time, until some sugar does not

dissolve (i.e., some sugar remains

visible in the pot). Remove it from the

heat. Pour the solution into the jar.

Add a few drops of food coloring and/

or ﬂavor extract if you want.

Gently place the string into the

solution. Cover the jar loosely with

plastic wrap, but do not make it

airtight.

Leave the jar in a spot where it will

not be disturbed. After a day, you

should see some small crystals form

on the string. For larger crystals, wait

a week or longer.

TIP!

If the crystals do not form, heat

the mixture up again until it

boils and add more sugar until

no more dissolves in the water.

Then replace the string.

GEEK

OUT!

WHAT’S

HAPPENING?

You are making what is called

a supersaturated solution of

sugar and water. Over time, the

sugar will adhere to the smaller

crystals on the string, forming

larger crystals.

Safety Note:

Caution! High

temperatures. There is

a risk of burns.

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