A spot swatch and a process swatch can look similar on screen while asking the printer to produce different separations. Inspect the released ink structure.
Identify the reproduction method
Spot colour uses a named ink separation; process colour is reproduced through combinations of process inks such as CMYK. A screen simulation of a spot swatch does not establish the actual ink or substrate appearance of its printed result. Primary reference: Adobe: spot and process colours.
Keep the agreed ink method with the colour requirement. A colour name in a filename or approval email does not show whether the released artwork retained a spot separation or was converted to process values. The document's actual colour objects and separations need to be checked.
Compare a fictional plate list
Imagine an artwork release is intended to contain cyan, magenta, yellow, black and one named spot separation called BRAND-A. A second export instead contains only the four process separations, with an approximate process representation of the named colour. Both may produce a similar composite preview on one display.
The plate-list difference remains meaningful even when the previews seem alike. This example describes an invented handoff, with no ink recipe, colour tolerance or prediction of the actual press result. It does not prescribe how a commercial printer should reproduce the brand colour.
Approve the intended structure
Request the separation view or equivalent document evidence showing which named inks the receiver will output. Check whether conversions occurred during export or reception, especially where transparent objects interact. Preserve the approved ink names and the actual release file identity together.
Judge final colour appearance using the agreed proofing and print evidence for the real process and substrate. The structural check verifies that the intended separations survived; it does not replace that appearance evidence. Keep both conclusions visible when approving a file, rather than accepting a visually similar composite as proof of identical ink reproduction.
Customer Questions
Does a spot-colour screen preview specify the mixed ink?
No. It simulates an appearance in that viewing system.
Can similar previews contain different separations?
Yes. Inspect the released document's ink structure.
Does the plate list approve printed colour?
No. Appearance requires the agreed process-specific evidence.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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