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

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Thames & Kosmos

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Why does mixing two colors of paint together

create a new color? Our eyes see light waves

of diﬀerent wavelengths as diﬀerent colors.

We see light consisting of all wavelengths as

white light. When you mix red, green, and

blue light, you see white light. However, paint

mixes diﬀerently than light. Each color of

paint absorbs some wavelengths of white

light, subtracting those out of the color that

reﬂects into your eye. The ﬁnal color you see is made

of whichever wavelengths are not absorbed by the

paint particles.

Leaf-Print Dress Help Barbie and

Nikki make the

leaf-print dress.

You will need: Brush, set of

paints, fabric sheet, plant

leaves, paper plate or paint

palee, newspaper or paper

towels, water, scissors, seam

sealant (optional), pin or clip

Gather some leaves of

diﬀerent shapes and sizes.

Cover a ﬂat work surface

in newspaper or paper

towels. Wear clothing that

you do not mind geing

paint on, as the paint may

stain. The paint is non-

toxic. If you get any on

your hands, it will wash oﬀ

easily with water.

Choose and mix your ﬁrst

paint color. You can use

the paper plate or palee

to mix the paints to make

diﬀerent colors.

Paint one side of the leaf

using the brush.

Immediately place the

leaf paint side down on

the fabric. Press the leaf

ﬁrmly down onto the

fabric, then peel it up

again.

Continue painting leaves

and pressing them onto

the fabric until you are

happy with the paern

you have created.

Repeat this process with

additional paint colors,

printing over some parts

of the previous prints.

Cut the fabric sheet in

half as shown. Save one

half of the fabric for the

hammock model.

The other half can be

wrapped around the doll

and clipped, pinned, or

stapled in the back to

form a dress as shown.

Tip: You may want to water

down the paint a lile. You

may also want to blot the

paint-coated leaf once

before printing with it.

How does leaf printing work? Plants turn water, nutrients,

and energy from sunlight into food through a process

called photosynthesis. This happens in the leaves. The

plant must transport the water and nutrients from the soil

up to each cell in each leaf. The veins in the leaf are like

pipes through which water and nutrients ﬂow. The veins

are oen thicker than the rest of the leaf, so when you

make a leaf print, the veins get pressed into the fabric

more and leave more of an impression.

In addition, the surface of a leaf is waxy. Water beads

up on the surface instead of sticking to it. Water-

based paint sticks to the porous, absorbent

fabric much beer than it sticks to the

leaf. This is why the paint transfers from

the leaf to the paper during printing.

WHAT’S

HAPPENING?

EXPERIMENT

Wrap

for dress

for hammock

Clip or

pin in

back.

Tip: You

can seal the

edges of the

fabric with a

liquid seam

sealant to

keep them

from fraying.

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