Impressions. Shoeprints The physical contact between the shoe and the surface results in a transfer...

Impressions

Shoeprints

The physical contact between the shoe and the surface results in a transfer of the individual characteristics of the shoe.

Shoes prints are often used to prove that suspect was present at a crime scene.

3-dimensional impressions

Footwear impressions are pressed into a soft surfacesuch as mud.

The impression is influenced by the weight of the person and the type of surface.

Casting a 3-dimensional impression

Photography Paul Ricketts, 2006

Sports Shoes


Boots


Lady’s shoes


Using Alginate to make an impression

1 - alginate powder

2 - pour the alginate into a plastic bag 3 - about 1/3 of a bag


4- add water 5 - squish the powder and water

6 - thoroughly mix7 - cut a small hole at a corner of the bag with scissors


8 - squeeze out the alginate onto the impression. Work quickly as alginate dries very fast.

9 - carefully pat into place

10 - the alginate changes colour when dry - carefully lift from the impression


10 - wash away as much dirt as possible

The finished impression

Pict of finished impression - to do


2-dimensional impressions

2-dimensional impressions occur when an image of the print is left on the surface.

Some 2-dimensional impressions are highly visible – muddy footprints on a cleaned floor – while others are latent or invisible.

2-dimensional impression: Blood



Latent 2-dimensional impression: luminol

Other impressions

Casts can be taken of the impressions ofother objects. Eg, tyre tread

Tire tread


Tire tread on ground


References

Images• All photography by Paul Ricketts, DUIT Multimedia, the University

of Western Australia.• J. Baines is the model for the sequence of photographs showing

taking a shoeprint impression using Alginate.• Shoes supplied by J. Dook.• Graphic design of slides by Trevor Hutchison, DUIT Multimedia,

the University of Western Australia.

Impressions. Shoeprints The physical contact between the shoe and the surface results in a transfer...

Documents

Transcript of Impressions. Shoeprints The physical contact between the shoe and the surface results in a transfer...