Looks like the yellow has faded.
To be a color error, there can not be so much of the tiniest dot of color on the stamp.
Your stamp is known as a chemical changeling where the chemical bleaches the stamp. There may have been a light cancellation on the stamp but has since been removed by the bleaching. If placed under a microscope traces of what was the cancellation may be seen.
Rob
You are all correct it is chemical.
What does not show on the scan is that three of the dots in the top right hand corner are faintly yellow.
However it will still go into my Australia collection as an oddity.
re: Missing Colour or Chemical Reaction?
Looks like the yellow has faded.
To be a color error, there can not be so much of the tiniest dot of color on the stamp.
re: Missing Colour or Chemical Reaction?
Your stamp is known as a chemical changeling where the chemical bleaches the stamp. There may have been a light cancellation on the stamp but has since been removed by the bleaching. If placed under a microscope traces of what was the cancellation may be seen.
Rob
re: Missing Colour or Chemical Reaction?
You are all correct it is chemical.
What does not show on the scan is that three of the dots in the top right hand corner are faintly yellow.
However it will still go into my Australia collection as an oddity.