How to write a brand-colour tolerance that is not a process-colour tolerance
A brand colour needs its own target L*a*b*, colour-difference formula, measurement condition, backing, and a tolerance that belongs to that colour. Do not copy the ISO 12647-2 solid ΔEab 5 onto a brand colour. Four-color control-strip solids passing do not stand in for that brand patch.
A brand colour needs its own target Lab*, colour-difference formula, measurement condition, backing, and a tolerance that belongs to that colour. Do not copy the ISO 12647-2 solid ΔEab 5 onto a brand colour. Four-color control-strip solids passing do not stand in for that brand patch.
Why a process-colour tolerance cannot be borrowed
The ΔEab 5 in 12647-2 is production drift for cyan, magenta, yellow, and black solids, not for a named red or a named green. Brand colour is often tighter, and you must say whether it is ΔE00 or ΔEab. The same “2” is not the same in both formulas. Add M1 or M2, white or black backing, wet or dry: miss any one and press and customer are not measuring the same number.
Four-color solids on the control strip hold the process. The brand colour needs a solid large enough for the aperture, read alone, judged alone.
Words that belong on one line
| Write | If you omit it |
|---|---|
| Target Lab* | Only a colour number is left |
| ΔE00 or ΔEab, and the number | Each side uses a different formula |
| M condition, backing, wet or dry | Gloss and show-through enter the reading |
| Separate from process-colour tolerance | Someone lets the brand colour through on ΔEab 5 |
When you record, write
- Brand colour conclusion on its own line.
- Do not copy the four-color strip conclusion onto that line.
- Formula and conditions sit with the target, not in another attachment that “counts as written.”
