Two Color Tones For Washington 1 Cent.

Salute,
I would appreciate your opinion regarding the stamp below. It is a #405, originating from the top row of either the lower right or lower left pane of the sheet.
What intrigues me most is that the ink specks on the back of the stamp appear to be both blue and green in the same offset position. Could it have been possible for two sheets to be printed consecutively without re-inking, or was the inking and wiping process performed before each individual impression?
I am particularly interested in understanding how such dual color tones could have occurred during production.

It just looks discoloured or bleached to me.

Thanks Ellie88, I thought and searched about that for the green ink. More results with other colors did not give blue.


Bleach/Chemical Pale yellow #8594; beige #8594; colorless
Sunlight/Heat Yellowish or brownish
Mixing (red) Gray or brown
Mixing (white) Pale/mint green
Washing Faint yellow or pale green

Color changeling due to sunlight. Chemical also possible.

I have one of these W/F and was told it is a color changeling from sunlight.

Thanks 3193zd, maybe if you could share a picture of your stamp, is it on the same position part with blue ink specks on the back?
I searched for the prolonged sunlight UV effect on green ink, the fading process will be the following I quote: "As the yellow component degrades and fades, the blue component becomes increasingly dominant, causing the ink to shift from its original green color toward blue-green, then to a faded bluish-grey and eventually degrade completely, leading to total color loss. The ink may fade to a barely visible brownish stain or disappear entirely."

Scroll down to the green stamps

https://stampsmarter.org/learning/A...gelings.html

It does not.Yours is a post production damaged stamp. Value is under 1 cent.

Much appreciated NSK, what is interesting that it went through to the ink specks.

Thank you for sharing your stamp 3193zd.