In
offset printing, a spot color is any color generated by an
ink (pure or mixed) that is printed using a single run. The widely-spread
offset printing process is composed of four spot colors:
Cyan,
Magenta,
Yellow and
Key (black) commonly referred to as
CMYK. More advanced processes involve the use of six spot colors (hexachromatic process), which add
Orange and
Green to the process (termed CMYKOG). The two additional spot colors are added to compensate for the inefficient reproduction of faint
tints using CMYK colors only. However, offset technicians around the world use the term spot color to mean any color generated by a non-standard offset ink; such as
metallic,
fluorescent, spot varnish, or custom hand-mixed inks.
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