Thames & Kosmos Master Detective Toolkit V2 handleiding

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Thames & Kosmos

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Handleiding

What can soil samples reveal

Pieces of dirt from the soles of shoes

can reveal a lot about where the person

had recently been walking. Sand, loamy

soil or humusy earth can all be clearly

distinguished under the magnifying

glass. Little pieces of grass may point to

a freshly-mowed lawn. Bits of decayed

leaves could come from a path through

a woodsy area with deciduous trees,

while a walk through a pine forest would

be revealed by bits of pine needles. To

learn how to differentiate various kinds

of soil with confidence, you should first

try practicing on some samples.

Here’s how:

1. Collect soil samples from as

many different places as possible

(one handful is enough) and save

them in clearly labeled plastic

bags.

2. For each different sample,

place a little in the petri dish,

break it up with the tweezers, and

examine it under the magnifying

glass. What is its color? Do you

see granules or grit? Do you

recognize any plant matter, and

if so what does it look like? Add a

little water and watch how the soil

reacts. How quickly does it dry

and how does it change as it does

so? That helps you estimate how

long the dirt had been on the sole

of the shoe.

3. Have your partner test you. Can

you match the sample he or she

gives you to one of the samples

you collected?

Analyzing soil samples

You will need:

Petri dish

Tweezers

Plastic bag

Magnifying glass

Crime scene pad

Pencil

Water

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