if I understand your request right, you want to create reference colours for your printer, that he or she should match with the correct colour? That will not work out like this. What you will need is a calibrated workflow and choosing a printer service provider with a calibrated workflow. In that sense, you can be sure, that green is your green, blue is your blue and red is your red. You need , however, accepting that colour conversion from screen to print is a conversion and differences will be there. A colour calibrated workflow only assures, that the differences are minimized to the point, that they get irrelevant to the eye.
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