Some Help Requested With Suspected Errors

Hello there,

So here's the story, I recently picked up a batch of USA FDC's for dirt cheap. USA isn't very popular here in Europe. And I noticed a few things seemed 'off' on some stamps. So I did some research but couldn't find anything concrete. They look like errors.

So anyway, here they are. If anybody can help me with this I would be very gratefull, Thanks in advance.

Here are they
[1] Banking se-tenant from 1975; I can vaguely remember that the native American cent was bronze, and the big coin right looks half coloured.



[2] First solo flight across the transatlantic 1977; Isn't this stamp more as a night sky ?, seems some purple is missing



[3] Pap test 1978; The left stamp seems to only show the slate




[4] Honouring Herkimer from 1977; I don't know what to think of this one. Red omitted, stamp put in sun ?



[5] Frank Lloyd Wright and American flag from 1959; Red omitted from USA flag




[6] Rural america from 1977; red omitted in combination with a normal one




[7] Jimmy rodgers from ????; Left one shows purple, right one doesn't. and Jimmie ... Looks a little pale





Thanks again :D

The red end of the spectrum sun-bleaches faster. Someone has been playing games with your covers. Your covers show the typical results.

The sun/UV light bleaching looks very deliberate on these stamps.

yeah, I have a bunch of these stamps with color changes due to people playing with chemicals on them

stamps having fun in the sun, while we are stuck inside

Have to agree with the others. May very well may have been on display, in a dealers shop in a box or on display on the wall.The uv from sun or flourescent light or just exposure to plain ole daylight obviously did a job on them.

Have to agree, but the slate color stamp may be something....who knows, but worth checking in my opinion...
Cool to look at though and research!

Sunshine color changelings including the red to slate.

More info on color changelings
http://stampsmarter.com/learning/Ar...gelings.html
Don

Thank you Don for the interesting and informative link!