1935 Yugoslavia Stamp In Wrong Color?

I am a long-time collector, but new to this forum. This stamp was part of a large collection I purchased. On the left is Yugoslavia Sc # 119, the King Peter II definitive of 1935, 1 Dinar in brown red. The right stamp appears to be # 119 in the wrong color. What do I have here? Any help is appreciated.

The only thing I could find was a reference at this webpage about the color of the 1D stamp changing to green when exposed to moisture:

https://worldstampsproject.org/yugo...s-varieties/

Sounds to me like that is what you have. I've never seen it before but maybe a Yugoslav expert can shed more light.

Joe

Indeed this is a misprint it could have happened when the ink from another printer producing the lime green stamp got mixed up with this stamp

I've never seen this total colour change,though partial changes are common.

Agree with Vayolene,
I have a bunch of these ..... "Chemical or Light damage"
I too, have never seen a full green before.

Thanks to all of you for helping solve this mystery! Just out of curiosity, I tried soaking my brown red copy in warm water for nearly an hour to see if the color would change at all. It did not. My guess is that some (but not all) of the many printings of this stamp used a water-soluble red ink mixed with the lime green ink to produce the brown color. I suppose that long exposure to water could leach out the red pigment in the color mix, leaving only the green.
Thanks again to everyone who helped solve this mystery!
~Glenn

It could be light damage then, or consider collector's using bleach in the soaking water.

Perhaps the green copy that I have is sun damaged, which might explain the overall color change on that stamp. The color changes on the 2 stamps shown by vayolene may have been caused by a different method, like exposure to moisture. The link provided by pnjstamps says that moisture is the culprit. I know that some red pigments used in inks are very susceptible to fading from sunlight. I would not be surprised if a red ink was both water-soluble, and fugitive in sunlight.

Of course bleach or some solvent could have caused the color changes too.