|BCP = Bluish coated paper||PVA = Polyvinyl alcohol acetate gum|
|OCP = Original coated paper|
A note on the 1d yellowish and greenish head varieties.
The yellowish head stamp is not actually yellow but contains less green than the greenish head variety. So when the two shades are compared with each other the yellowish head stamp appears to be more yellow than green. Do not compare these shades with any other 1d value listed. Use only the relevant pair that are listed together e.g. P12 & P12g