Thames & Kosmos Master Detective Toolkit V2 handleiding

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Thames & Kosmos

52 pagina's

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Handleiding

Casting footprints in plaster

Tracks in the ground can disappear

quickly. Rain, pedestrians, or bicyclists

can destroy them in the blink of an eye.

That is why you have to save suspicious

tracks. You can do that by pouring out

plaster mixture, which then hardens to

retain the shape of the track.

4. Pour the mixture into the track, and

spread it around with the spatula.

5. Wait at least one hour. Now the

plaster will have hardened and you

can carefully take the block out of the

ground.

6. Carry it home in a large plastic bag

and carefully brush off any pieces of

dirt before you place it in a labeled

archive box.

Preserving footprints

You will need:

Casting frame (from die-cut sheet)

Plaster powder

Measuring cup

Spatula

Tweezers

Adhesive tape

Water (plastic bottle)

Permanent marker for labeling

Brush

Large plastic bag

Here’s how:

1. Insert the four cardboard casting

frame sections into one another

at the pre-cut locations to make a

frame that is slightly bigger than the

track. Secure with tape. Position the

frame around the track.

2. With the tweezers, carefully

remove any extraneous objects, such

as leaves, from the track.

3. Mix a little plaster with water in

the measuring cup, to form a gray

paste (2 parts plaster + 1 part water).

Don’t make it too thick, or it won’t

flow into all the nooks and crannies

of the track.

Important! Pay attention to the

warnings on page 1 and on the inside

front cover about working with

plaster!

Caution! Plaster can create dust. Do

not inhale the dust.

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