In printing, anti-set-off spray
powder is used to make an air
gap between printed sheets of
paper. This enables the ink to dry
naturally and therefore avoid the
unwanted transfer of ink from
one printed sheet to another. The problem can occur with most
types of printing. Anti-set-off spray powder is
generally made from natural
starches from plants and
vegetables. There remains a
demand for soluble powders
(sometimes known as vanished
powders) based on natural
sugars[1] which are often used
when the final printed sheet is to
be varnished. In addition there is
still a relatively small amount of
powder made from minerals (e.g. Calcium Carbonate, rather than
Talc) used in offset litho printing; however these mineral powders
are not so popular because of the
potential health implications and
abrasive properties.
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