When
working with photographic negative processes, either black &
white or colour, any object laid on the paper will print as
a negative image, the object will block the light and leave
a white shadow on the paper where it lay. The subtle tones of
the photogram will relate to the objects laid on the paper.
Semi-transparent
and transparent objects
A section of a photogram of a semi transparent bottle Objects
like bottles, glass ware, crystal, plastic bags, feathers, cloth,
paper, some leaves and flowers etc. can produce an infinite
range of textures and half tones (gray tones) that only reveal
themselves at the development stage.
Etched
areas of glass or opaque dried material stuck to the glass
can create distinguishing marks on the paper where the etched
area is more opaque and or diffuses the light. Impurities in
the glass, like old bottles, can also contribute to marks like
this.
Cut
or embossed glass can act like a camera lens or prism,
altering the direction of the rays of light, concentrating
it in some areas while deflecting it away from others.
When a ray of light enters a transparent medium from
a different angle than it is traveling at it changes
course and can be focused to a single point or deflected
away from a point. This is similar to what happens with
a magnifying glass where the light is concentrated on
a single point. Or a prism where the light is
split into its component colours.
The
small image below is a photogram of a heart shaped
glass ring container. The facets cut in the glass
have created the pattern.
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Transparent
Liquids
Even mixes of coloured oil, wax, blood, water and other liquids
can be applied onto a glass sheet and then laid onto the paper
to be exposed.
The
object to use most of all use your imagination. |