Thames & Kosmos Barbie STEM Kit: Science Saves the Day handleiding

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What happened to the ink from the marker in this

experiment? A lot of materials appear to be uniform,

but they are actually a mixture of diﬀerent substances.

In this experiment you saw that the ink from the black

marker is actually a combination of diﬀerent color

dyes!

The method used in this experiment to

separate the diﬀerent dyes in the marker ink is

called chromatography. Chromatography comes

from the Greek words chroma, which means “color,”

and graphein, “to write.” So when you are doing

chromatography, you are writing in color!

Chromatography Dress

8 9

Help Barbie and Nikki make a rainbow in a

test tube. First, follow these steps to build a

test tube holder.

Done!

Cut small slits in the two

upper corners of the fabric.

Insert the doll’s arm into

one of the slits and wrap

the dress around the doll.

Insert the other arm

through the other slit.

“That looks so cool,”

Nikki said. “Let’s do the

same thing to our lab

coats! We’ll really stand

out in chem class!”

“These colorful

gradients are really

speaking to me. Maybe

I want to wear a rainbow spectrum dress to

the Gala,” Nikki said.

“That would look really

good. But how do you

make a rainbow?” Barbie

asked.

“One time, we made a

rainbow in a test tube,”

Nikki answered. “Let’s

try it. We need some

stuﬀ from the kitchen.”

WHAT’S

HAPPENING?

BUILD

Adjust the wrap

dress on the doll.

You can belt it

with a small strip

of fabric.

Chromatography works by dissolving

the substance that you want to

separate, in this experiment the dyes in

the marker ink, into what is called the

mobile phase. The mobile phase is then

passed through a stationary phase.

In chromatography the mobile phase

moves, just as the name suggests, while

the stationary phase does not. In this

experiment what do you think was the

stationary phase? What part of the

separation process did not move?

In this experiment the stationary

phase was the cloth. When the water

and ink pass through the cloth, the

diﬀerent dyes are separated because

they are aracted to the cloth by

diﬀerent amounts. The dyes that have

a strong araction to the cloth do not

move much, so they stay at the boom edge of

the cloth.

It may seem strange that the dye would be

aracted to the cloth. But the water is actually

able to move vertically up the cloth because

it is pulled by its araction to the cloth. This

phenomenon is called capillary action.

Done!

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