Newfoundland C19 Airmail Stamp Under Inked?

Hey guys need your opinions on this stamp

Under inked?


Normal


Both are mint hinged.

Hey Trodent
I have seen similar when I took printing in high school for 4 years...We knew when ink started drying after a long run it would turn lighter.

Just my opinion buddy.

Robert

The ink looks a bit thinner on the stamp in question. Also, the ink looks to be "toned down" or duller, as if it is slightly oxidized.

If the stamps were shown on the same scan, overlapping, it would give a better idea of the difference in the ink.

And remember also bookbndrbob,, printers who do a run that overlaps say 2 or 3 days, would clean th plate ad rollers for the next days run...It is very hard ( and I did run into the same problem) to mix the exact same ink percentage to achieve the exact same colour.

Robert

What the 2 scans of same stamp show me are 2 different shades of blue. Agree with wert on his opinion.
Not sure about the under inked theory.....

René

Is it just my old eyes messing with me again or does anyone else see a difference in the paper color? If so, might that support the oxidation theory?

Terry

It is two scans, so this is comparing two images and not two stamps.

Who knows what the delta is between the two images? Could be the scanner, the way the files were saved, a filter that was applied to one but not the other. Even if the stamps were scanned one after the other with the same settings, there could be differences. Maybe the lid was open on one scan and closed on the other. Could be many things.

Scan together and then at least we can form opinions with the stamps relative to each other.

Based ONLY on inking levels, it does appear the top one is slightly less inked than the bottom one (note tree area). But when I call a stamp under-inked it would have at least some small areas of missing inking.
Don

Exactly.

Robert

Here is side by side comparison, single scan

Hi Trodent

I was trying to think why your left stamp is lighter in colour...I was experimenting with colour more that oxidization...Here is what I came up with....

First of all th colour blue is made with Cyan and Purple as shown in the chart below.



I ran it through one of my many colour identifying software..I noticed the stamp on the right DID NOT have as much BLUE in it..It was a index of 60 parts as compared to the left stamp which measured 75 parts.
It seems when a NEW batch of paint was mixed, the printer did not mix as much CYAN as he did on his/her first batch as shown below...Remember, this is just my opinion after spending 4 years training in school as lithography and one year on the job.

Very interesting analysis, wert !

René

The OP asked about under inking; ink color is affected by toning and other environmental issues the two stamps may have seen over time (note the color difference in the paper color).

Under/over inking is easily compared using gray scale images since we are talking about the amount of ink applied. Convert the scanned image to gray scale, zoom in on a few different areas on both of the stamps, compare inking levels by noting the sharpness of the details. Gray scale 'levels the playing field' by removing ink color and environmental deltas from the analysis.

There is a difference in the amount of inking in these two stamps. But is one under-inked? One obviously has a bit more ink. My opinion is that both stamps fall within 'normal' inking variances.
Don

When ink is prepared and applied on a subsequent printing, many stamps are printed (10,000's to millions). This would result in catalogs listing a color variety if the ink were noticeably different. In Scott, I see only one color (bright blue) listed for this stamp.

I have never seen seen a gray blue color on this stamp before. The paper is slightly toned, indicating that the stamp has not been stored in the best of conditions. So, rather than being an illusive, or "one-of-a-kind" rarity, this looks like an oxidized, slightly under inked stamp to me.