Ghost Image

[Casey2296]

Appropriate question for tonight...
Can someone help me understand the process of how a ghost image comes about. For example this E94 Speaker, it looks like a bleed through to me but i don't know much about the printing process so I'm looking for a little Net54 member education.
Thank you in advance.

[CobbSpikedMe]

Hi Phil,

I believe that is a wet sheet transfer. It happens when one sheet is placed on top of another sheet that is still wet. The ink transfers to the back of the card that is laying on top of it.

[steve B]

It could be a wet sheet transfer, but it's very solid if it is.
(The technical term is an "offset transfer" but wet sheet transfer is close enough and has become the standard term)

More likely it's an impression cylinder transfer. Those are usually very strong and detailed.

The plate or stone is dampened, inked, then prints to an offset blanket, a rubber sheet. That then prints to the paper or cardboard. To give it something to press against, there's a smooth metal cylinder - The impression cylinder.
If a sheet doesn't feed, the blanket prints to the impression cylinder. Then when the next sheet feeds, both the blanket and the impression cylinder print to the cardboard, except the impression cylinder prints reversed on the opposite side.

[Casey2296]

Ah, that would make sense. It's a very precise print for 1911 tech, I would assume if it's a wet transfer there would be more smudging. So in your example I would assume the color layer in this example would be laid down first then the black layer.

[oldeboo]

For the visual people, like me, I believe this image from online shows what Steve is explaining. It makes a lot more sense when I can see it. It also helps to understand the sequence of how some of these oddballs occurred and the purpose of each process. WST is from the stacking of paper AFTER printing, ICT is when the ink gets transferred to the impression cylinder then to the paper DURING printing. These differences explain the strength of transfer.

[Casey2296]

So in this example did the blue ink gets transferred from the blanket cylinder to the impression cylinder by mistake? For example: if a sheet didn't get fed but the ink rollers kept rolling therefore transferring inK to the impression cylinder and resulting in a ghost image on the next sheet that went through?