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Look up Texture Mapping in Photoshop and Displacement Map Photoshop and you'll get closer to the results you're after than trying to do it with just opacity.
It's a DuPont proprietary colour proofing process. It was originally a photographic process. They now have a digital version -- basically a colour-calibrated high-res inkjet print. I haven't actually heard the term used in the fully digital (computer to plate) era though. Maybe there are just a lot more options from competitors these days. Anyway, it's ...
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