Good Day Everyone; very long time lurker and I finally decided to create a post. First, just wanted to thank everyone for their incredible knowledge - i've been collecting for the better part of 40 years, yet I'm continually amazed by the good graces and expertise of the board members. Thanks Again -
But for the topic - Came across this while browsing a collection online; I was able to acquire it.
I know it's a changeling. 1936 TIPEX was never issued in blue (however, research indicated 1600 pieces from 120 sheets were 'accidentally' printed in a violet / black due to an error with black dye. All of those were accounted for and destroyed in '36 - based on records).
I found it pleasing to look at although I have never seen a changeling in the TIPEX sheet, it doesn't appear to me that UV (exposure to sunlight) would completely wash away the red dye in the original violet. I'm under the impression that 1936 dye was relatively stable.
So I would guess it's chemical alteration. Carbon Tetracloride? I know that it attacks certain dyes, but perhaps someone could enlighten me for the actual chemical used to do this?
BTW, the gum on the back is intact with a few disruptions i.e. hing placement removal. My own scanner washed out the image so I'm posting a nice photo of it.