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Blue is used water symbols. Many symbols use blue.
There are three versions of blue in the default OCAD colour table:
Blue colour number 2 used by most water symbols
Blue 50% colour number 3 used by symbol Lake (301.0)
Blue 20% colour number 20 not used by the default symbols
The problem with colour clashes is that the screen and composite (local printer) output does not necessarily reflect the separated output.
If you digitise your map in the same way as you would draw it, that is, you cut out all underlying objects beneath the blue, then there is no colour problem.
There are alternatives, the most common method is to make the blue colours automatically knockout the lower colours. To do this, you have to change the colour table.
There are more details in the Main Help File or in the Colour Help file.
The Pantone Matching System is one of the colour models used by commercial printers.
IOF Specifications define the following colours, their approximate CMYK (process colour) translations are given:-
|grey is usually applied as a tone of the black separation.|
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