Changelings were often a topic of conversation when I used to attend my local stamp club in Belleville, IL. Sometimes stamps were brought in that appeared to be green vs blue and a couple old timers would butt heads and eventually the matter would be dropped and they'd shrug their shoulders at whoever brought the stamp in. Here is an example of perhaps one. Could it have been a different tint of ink used, as many suppliers of ink, particularly long ago, didn't have the exacting color detection instruments of today, or is it merely conditions one of the stamps was exposed to which lightened it.
These are 15 cent Canal Zone airmails issue date of Nov. 18th, 1931. Released in nine different denominations. The difference in shade is subtle yet quite apparent.
My guess, judging from the color of the paper, is that it is mostly a change due to exposure to elements. Note the slight yellowing of the paper on the stamp that's above the other.
JimmyB
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