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GCO does not impact the L*.
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Paper white L* is not impacted except for the slight OBA blocking of GCO (this makes the paper more archival BTW).
2.5. Yes. Simply print with one of the NoGCO curves for linearization.
- You can overprint but the result will not always be predictable on some paper surfaces. GCO and Pro ink were built to work together and not separately.
3.5 Super small custom papers sizes can fail on many epson printers.