Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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EXPERIMENT 6

Invisible Light

WHAT’S HAPPENING

Both plants contain UV-fluorescent

substances that only become visible

when viewed under the UV lamp. The

curry powder glows with a pretty

orange light. This luminescent orange

material (called curcumin) comes from

yellow curcuma or turmeric, a spice

that gives all curries their

characteristic color. Depending on

taste and region, curry powder also

consists of lots of other spices, such

as coriander, cumin, and pepper.

When the powder is dissolved in oil,

you can observe a really striking

luminescent effect. The strong

yellow fluorescence of the

celandine is produced by the

chemical berberine contained in its

latex sap.

Hunting for plants

Plant compounds don’t just glow with a light

blue — there are other completely different

colors to discover as well.

YOU WILL NEED

› UV lamp

› Test tube

› Curry powder

› Cooking oil

› Celandine plant (botanical

name: Chelidonium)

› Cardboard

HERE’S HOW

1. Fluorescent curry powder:

Look at some curry powder under your UV

lamp in the dark.

Then, mix a little curry powder with some

cooking oil in a test tube, and let it sit for

about half an hour while stirring

occasionally. Then view the test tube under

your UV lamp in the dark.

2. Fluorescent celandine sap:

Pick a few stalks of celandine and

press them in a folded

piece of

cardboard

until some

milky sap

comes out.

Shine your UV

lamp on the

celandine-

stained cardboard

in the dark.

Avoid getting the

celandine juice on

your fingers, and

thoroughly wash your

hands immediately

after the experiment!

Cooking oil

Curry powder

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