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All images, even line art (text) is screened in gravure. The exception being Intaglio engraving, which prints currency/money. The best place to look to identify gravure is at text. The edge will be saw-toothed, ragged, jagged, stairstep'd, rasterized from cell screening. The photo you show...

The photo of "effect o letters" is definitely gravure, as noted by serrated edge from screening cells. You said the substrate is a transparent foil. Did you mean to say transparent film?

The defect lines are parallel to which direction, drum rotation or laser head?

"B" for Brightness, "B" for Blue.

From what I remember, gum Arabic, is sap/syrup from a tree. It's also used in foods, so is eatable. I'm thinking it can be diluted with water and sent down a sewer drain. Agfa website should have a MSDS safety sheet on it.

Is the coating inside the drum being thoroughly stirred/mixed/agitated prior to pumping? The matte/dull agents are heavier solids and tend to settle to the bottom. Roller coaters don't apply as thick of a film as an anilox. Do you know your coat weight as measured on a scale on an aluminum foil...

Print Process: Flexo, wide web Substrate: White Poly film Ink: Solvent based (heatset) Anilox: 1,000 lpi BCM: 2.0 billion cubic microns % Dot Size (file): 1% Lpi: 133 Quality: Too much pressure (anilox>plate, plate>film) causing hollow center dots (donuts) with halo ring fringe...

Some more info would be helpful. Most modern coaters are anilox/doctor blade, not slip/nip roller. Are you applying from a blanket or a flexo relief plate? Are the lines in the same direction (parallel) to sheet travel? Is base sheet litho printed or is it digital?

Also Known As (AKA) "Commercially Acceptable Color". It's what the printer says is acceptable.

The most common method for determining ink/water balance is to see if the background of the paper is clean or dirty at the gripper/lead edge. This is a macro, unaided view with no magnifying glass. Most press operators during make-ready drop the water feed until they see the dirty edge than...

Just so I understand better, do you mean imaged polyester plates or laser toner plates from a copier?

Can you show a photo?

I'm not a press operator but it's a combination of slow down wheels and blower fans.

Most web (roll) presses print blanket-blanket perfecting. Perfecting means both sides of the paper web are printed in a single pass. Both blankets provide pressure to transfer the ink from the blanket to the paper. A depression smash (~>0.004") in one blanket can also affect in transfer on the...

The void defect has a vertical mirror image symmetry, same shapes, same locations. Did this printer only have one press at that time? The page numbers are the same (3&4) but the pagination/imposition or form layout could change depending on the number of pages. Some newspaper presses can print 2...

Just curious about why you find this "spot" issue so interesting? To me, a "spot" is a dark image area. Your defect is a "hole" in that it is missing the image area, so blank or void. Next, what printing method was used for this newspaper? In 1969 it may have been "Letterpress" that used rigid...

Generally, lower lpi is more "controllable" or "stable" on press. However, the tradeoff is visual resolution and detail. I would output same image at 150 & 175, print test it to compare.

While you photo shows a register fit problem, I wonder if printing with Frequency Modulated (FM) screening rather than Amplitude Modulated (AM) screening will create a normal viewing distance appearance of being sharper with more detail?

Again, the old GATF (now Printing United Alliance) sold this target. It was a separate component included in a larger test target form. The solid horizontal bar should be at orientated after the diagonal lines. Too much ink or too little water you get feathering, tailing. Note that catchup and...

Yes, determine/correlate SID (Solid Ink Density) to CIE Lab targets. If coating inline, this almost negates any dry back/down effects. If not, dry back/down is about -1 Y, -2 C, -4 M, -15 K on gloss coated paper. So compensate by adding back into the wet SID.