Paper varieties viewed under long wave light.
BCP = Bluish coated paper PVA = Polyvinyl alcohol acetate gum
OCP = Original coated paper
!

P211 - 7d Emerald green, BCP/PVA, two 4.75mm screen 150 B3 phosphor bands, upright print (Cyl 3) - Deegam PD 8.1.1 - S.G specialised U19 - Stoneham M36 - Concise 737
!

Two 4.75mm B3 phosphor bands from sheets cylinder 3 [1.7.68]

P212 - 7d Emerald green, OCP/PVA, two 4.75mm screen 150 B3 phosphor bands, upright print (Cyls 3, 4) - Deegam PD 8.1.1a
!

Two 4.75mm B3 phosphor bands from sheets cylinders 3, 4