Rainbow Colouring
Also called split duct printing. This colouring process used in offset printing is used to protect security documents against colour separation or copying, by subtly merging colours into each other resulting in a gradual colour change.
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Also called split duct printing. This colouring process used in offset printing is used to protect security documents against colour separation or copying, by subtly merging colours into each other resulting in a gradual colour change.
Source : Click Here
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