Deutsches Reich - Purple Adolf - What's Wrong With Him?

Hi all, can anyone tell me more about this Adolf stamp (MiNr.785)*(stampworld nr.777)? The third one from the left is two-colored, from the top to the eye line it is light purple and below the eyes it is darker purple, I can't find anything about it, except different shades of purple throughout the series... the pictures don't show it completely, but in reality you can see the difference in shades on this stamp very well

This stamp comes in a wide range of colors, all normal. The gray one is an anomaly, haven't seen one of those before. This particular color also appears to be light and water fugitive. All collectible.

The third stamp from the left could be a color changeling, being partially exposed to sunlight, or possibly a chemical agent.

I bet it lived in a manilla stockbook Reds fade so easily

Or with help from a pair of scissors, Adolph can become bi-color....

But I digress.