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Nosco.com A plant in Lockport, NY near Buffalo

So, what was percentage for dE'00 <2.0, 2.5, 3.0?

Your software should be able to generate the Pantone Plus fan guide with ECG (Extended Color Gamut) and list the Delta E (dE) for each solid to process match.

It's a C1S, Coated One Side. Often called CCNB Clay Coated News Back.

Without knowing the true root cause, the only term I would use to describe this is the nonimage area or background is printing dirty. There are technical differences between catchup or dryup (not enough water), tinting and toning (too much water, look for wash/flood marks and over emulsified...

So you want to calculate a flood coat weight. Weight before, Weight after, Subtract to find difference, Divide by area size, Calculate to whatever units you want., lbs, gram, inches, feet, etc. If on non-porous substrate (film, foil), can be done directly. If on paper or board, need to test on foil.

Your ink supplier should be able to provide this info. Depends on anilox BCM (900 cpi & 2.1 BCM) and % solids of inks (solvent based ~20%).

You can use Substrate Corrected Colorimetric Aims (SCCA), which is a mathematical conversion.

The calibration is for not each different paper type, that's not necessary. The calibration is for just 3 broad general groups, gloss coated, (satin,matte,dull), and uncoated

Generic is for "close enough" dE'00 <= 5 @95% No, you measure SID & TVI. SID is Solid Ink Density, TVI is Tone Value Increase, dC is C* Chroma

How do you manage your color consistency in your printing environment? Calibration gets the color accurate, then process control keeps it consistent, repeatable. Do you fingerprint every press run setup? Each press is fingerprinted with 3 stocks, gloss, matte, uncoated. Purpose is to see how...

Clarification: Lines are darker or lighter? Show in image or non-image area?

You print a register grid test form, scan it, then software adjust for any distortions (fan out). I think Heidelberg has a version.

I assume your are looking for the CMYK process equivalents and not the ink formula? How old is you fan guide?

Alois idea of asking a local printer to make measurements is a convenient idea. They or you could do it at their plant.

Has paper grain direction been confirmed, should be grain long, parallel to press cylinders. Has press packing (thickness of plate, blanket, packing) been confirmed? Are individual ink colors progressively changing size and not fitting, or are all images fitting but just longer/shorter?

To measure the solid ink density (SID) you will need to find printed image areas that are 1) 100 % solid and 2) large enough for the aperture window (~2.0mm). I assume you only have the finished books and don't have access to any QC flat press sheets or folded signatures?

Just for the record, the color difference between Pantone 400 and #7535 is NOT close! dE'00 = 6.8 #7535 is much yellower and darker

Pantone #7535 & 400 are near neutral (shades of gray). That is very meaningful information. Visually the eye is very sensitive to any hue change in them. Also, Delta E (dE, DE) is only magnitude, not direction. So a dE 2 can become 4 if it moves in opposite directions. You mentioned the only...

Need some clarification. Are you are printing spot colors (Pantone) or CMYK process builds, simulations of them? If spot, are they just solids or do they contain screen tint dots? How much of a color shift was there between press runs (dE)? Were jobs exact reprints or similar graphics (family...