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Is the number (9/6) the reference color, or what you are getting from the Colorado? If the former, can you post the best red you are getting from the printer?

Do you have a reference for the target color (Pantone spot or physical specimen)? Can you take a (well lit) pic of the two and post?

For 3-layer Sandwich jobs, the white ink serves as a diffuser, so 60-percent white is typically all that is needed. That prints at about 44 square feet per hour.

This would be printed using a 3-layer Sandwich print mode - Color-White-Color.

See the attached PDF, it details the specific functionalities included in the various OEM and retail versions of Flexi.

There is a minimum carriage scan length, to ensure that the media movement through the cure unit is relatively consistent regardless of the media width, to ensure that the ink is cured.

UV cure inks always contain photoinitiators, which are inherently yellowish in color. In order to hide the photoinitiators, UV white inks include dye-based colorants. Dyes break down quickly when exposed to sunlight, so the UV white inks start out white, but yellow significantly over time with...

Static Cling vinyl contain lots of plasticizer, which can make ink adhesion more challenging. Try cleaning a defined area with Isopropyl Alcohol and mark that area with a sharpie pen. Then print a job that extends through the cleaned and non-cleaned areas and see if there is a difference in...

Eco-solvent printer inks are primarily composed of ether-derived solvents, which emit volitile organic compounds (VOCs) as the inks are passively evaporating over a period of hours or days. For more information on human ingestion of significant or repeated concentrations of VOCs, and their...

Have you measured the physical prints to quantify the color shift?

Can you post well lit pics that show the color drift that you are seeing (start vs end of print run)?

Yes, printing in mirror to a clear film, and then backing with a second piece of white vinyl would likely work. If you have a Latex printer with white (7/ 800 W), you could mirror print to clear and overprint with white, producing with a single piece of media.

The newest firmware (PLS_40_22_52.1 released last week) is reducing the Preparing to Print time further. Note that the issue is not warm-up time, it is the time it takes to complete the Optical Drop Detection and auto-clean sequence. For the first print of the day, this time should be between...

Check the resolution of the raster file that the RIP software is set to generate. I generally use 600 dpi (should really read ppi) for everything sent from the RIP.

https://www.printos.com/ml/#/medialocator

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Most digital inks are largely translucent, meaning that light passes through the ink. When printing on white opaque media, this causes the light to reflect back to the observer through the ink. When printing to clear or transparent media, the light does not reflect, it passes through the ink and...

The large gray area is about a 3 dE00 shift, which is particularly visible in gray tones, even more than other hues

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