Here's a normal:




Catalogued color shades (as per Sassone):

Bright blue (typical color)
Sky blue
Blue
Slate blueardesia
Dark blue
Bright indigo
Deep ultramarine blue


There is a note in Scott:

"Forgeries of the inverted and double head varieties have been made by applying a faked head embossing to printer's waste without head. These forgeries are plentiful."

This small extract is from this site: Here

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