The single-action airbrush, sometimes known as a poster brush, is simple in
design. With single-action airbrushes, downward pressure on the finger
lever releases the flow of air and paint. Some models of single-action
airbrushes allow adjustment of the nozzle to regulate the amount of fluid
flow. You may also adjust the finger lever to regulate the amount of air
passing through the airbrush. These airbrushes work well for simple
illustrations and large backgrounds. Single-action airbrushes may use heavy-
bodied pigments such as tempura or casein.
Figure 6-2 is an example of a single-action airbrush.
Figure 6-2.Adjustments on a single-action
Adjust the spray pattern of single-action airbrushes before use. After
adjustment, only increasing and decreasing the distance between the airbrush
and the paper surface will vary the spray pattern.
To adjust single-action airbrushes:
Turn off the fluid control at the nozzle.
Hold the airbrush ½ inch in front of a scrap of paper.
Depress the finger lever and slowly open the nozzle (fluid control)
until a wisp of color appears.
To make the spray pattern wider, continue to open the fluid control.
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