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The half penny orange Queen Victoria Jubilee stamp has a rather spectacular color changeling. It is found as a blue green stamp.
I'm afraid you have two different stamps mixed up.
The half penny QV Jubilee stamp was officially issued in 2 different colors: vermilion and blue green. There is NO color changeling from vermilion to blue green.
However, there IS a color changeling from blue green to bright blue. This only occurs on some of the blue green stamps due to a specific ink constituent used during part of the print run.