Most candidates were able to
- define lithography
- list tools used in lithographic process.
However, they were unable to state the function of the tools used in lithography.
The expected response is given below:
- Lithography is the process of printing where both the image and
non-image areas are on the same plane. The image area is the ink receptive surface while the non-image area accept water.
(b) (i) Materials – Film, masking/cellotape, fixer, developer, deleting
fluid, masking sheet, litho sponge, gum arabic, inking solution,
plate, water, ink.
(ii) Film – It is a light sensitive material used to obtain image on the camera from original copy.
or
used to transfer image unto the plate.
Plate – Image carrier for printing machine
masking/cellotape – to hold down film for assemblage.
Fixer – remove the remaining unexposed silver particles from
the film emulsion.
or
It makes the film insensitive to light.
Developer – used to bring out exposed image on film.
.
Deleting fluid – used to remove unwanted image on plate.
Masking sheet – used to protect area on the plate that are not
to be exposed to light.
Gum Arabic – It is a gum solution applied on plate to prevent
plate oxidation .
Inking solution – used to ascertain the acceptability of ink by
image area of the plate.
Litho sponge – soft material used to develop and clean the plate
surfaces.
(c) (i) Tools – Ruler, Surgical knife, Rotring pen, Punch, T-square,
Brush, Thermometer, set square, scissors, brush, basin/tray, sponge.
(ii) Ruler – used as a guide during cutting and accurate
measurement.
Surgical knife – use for cutting and stripping.
T-Square – used to lay film or plate straight on planing table.
Punch – to create hole on film or plate for registration
Brush – used to apply opaque on the film.
Thermometer – used to determine the darkroom temperature.
Set-Square – used to lay film or plate squarely on planning table.
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