Paper varieties viewed under long wave light.
BCP = Bluish coated paper PVA = Polyvinyl alcohol acetate gum
OCP = Original coated paper
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P221 - 9d Myrtle green, BCP/Arabic, two 4.75mm screen 150 B3 phosphor bands, upright print (Cyl 2) - Deegam PD 10.1.1 - S.G specialised U22 - Stoneham M9 - Concise 740
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Two 4.75mm B3 phosphor bands from sheets cylinder 2 [8.8.67]

P222 - 9d Myrtle green, OCP/Arabic, two 4.75mm screen 150 B3 phosphor phosphor bands, upright print (Cyl 2)
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Two 4.75mm B3 phosphor bands from sheets cylinder 2 [?.?.67]

P224 - 9d myrtle green, OCP/PVA, two 4.75mm screen 150 B3 phosphor bands, upright print (Cyl 2) - Deegam PD 10.2.1 - S.G specialised U23 - Stoneham M39 - Concise 740Ev
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Two 4.75mm B3 phosphor bands from sheets cylinder 2 [29.11.68]