Victoria Numeral One Cent Blue Instead Of Green Stamp

Hello,
Does anyone know anything about this non listed blue colour variety. The stamp does not appear to be fake.

Probably a color changeling, either environmentally or chemically


Peter

Is it just me, the stamp Queen Vic now looks so much nicer in blue than the original green?

This appears to be exactly the same as the well known British "Blue" Victorian halfpenny stamp. In that case the yellow chromate pigment that was used to make the original green colour was changed twice. I cannot remember what chromate pigments were used but one was the highly toxic lead chromate. The second pignut was slightly water soluble and was only used for a few months

Soaking a stamp with this soluble yellow pigment dissolves it and gives the blue colour changeling.

I am sure you can find info on the web about this.

AQ

Thanks for the excellent explanation. What I find odd, however, is that this is the only stamp of this type that I have ever seen in 60 years of collecting. There should be more even if the pigment was used for only a few months or at least a published article in philatelic literature.

You can see the un-evenness of the color across the face of the stamp; a sure indication of a changeling. This is also a common changeling color fade, see other examples here
https://stampsmarter.org/learning/A...gelings.html
Don

Thanks for the usefull link. I also have the Jenny changeling depicted.
Here is another one from the US