Crystal Makers · Connected Through Play

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Crystal Makers

I remember doing this project as a kid and then as I got a bit older discovering that "rock" candy was really just sugar crystals that re-ordered themselves. This has always been a family favorite activity and makes a great time to share ideas and observations while learning some kitchen science.

Building on Day 1 you could also consider using salt - not as fun to eat but a great comparison.

For the full version of this activity, with suggestions for how to vary by age visit the Curious Kitchen classroom #Crystal Makers.

Post your progress if you try this one.

Crystal Makers

Sugar can seem to disappear into water, but it isn't gone. With a little patience, you can watch it come back as beautiful crystals that grow a little more each day.

Gather Your Gear:

1 cup (250 mL) water
2 1/2 - 3 cups (500 - 600 g) granulated sugar (or salt)
Small saucepan
Wooden spoon
Heat-safe glass jar
Wooden skewer, cotton string, or pipe cleaner
Pencil or craft stick
Clothespin (optional)
Food coloring (optional)
My Science Notebook (optional)

Be sure to wash your hands thoroughly before handling food.

Adult help is needed for heating the water and pouring the hot sugar solution.

Steps:

Wet the wooden skewer, string, or pipe cleaner with water. Roll it in a little dry sugar and let it dry while you prepare the sugar solution.
Ask an adult to heat 250 mL (1 cup) of water until it is very hot, but not rapidly boiling.
Stir in the sugar a spoonful at a time until no more sugar will dissolve. The mixture should look clear.
If you would like colored crystals, stir in one or two drops of food coloring.
Let the sugar solution cool for about 10 minutes.
Carefully pour the solution into the glass jar.
Suspend the prepared skewer, string, or pipe cleaner into the middle of the jar. It should not touch the bottom or sides.
Place the jar somewhere it can remain undisturbed for several days.
Check your jar each day and record how the crystals change.