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wasn't asking for the color of my stamp from the photo taken just wanted a list of colors.
I considered that a possibility.
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Why do they make a color chart?
For the same reason they list shades: to make you part with your money.
Most colour charts are useful for certain types of printing. And even US and GB charts may not coincide.
A famous chart is Pantone's. Why would a 1960s invention be useful for 1912 stamps that were listed soon after?
As long as you know how to recognise faded and washed-out colours and understand that cancels, dirt, and paper discolouration may change the appearance of a colour, this
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My advice is to build your own reference records
isn't a bad idea at all.
Of course, blindly assuming a stamp with any of the three dated postmarks as at the bottom of the preceding post must be a 1912 stamp is silly.
In 1913, the ½d and 1d stamps were printed in sheets that had the multiple cipher watermark. These were cut into strips and pasted into rolls first issued in August 1913. These stamps are much more valuable than the corresponding simple cipher printings. So, unless you know what colours you should be looking for, I would check those three stamps (especially the left two) for their watermarks.
If you come across a pale scarlet "simple cipher" stamp with a coarse printing and rough paper, especially with a 1922 cancellation, you might want to check whether it is from the experimental Somerset House coil printing.