Dick,
b. If BS381 C #31 Light Battleship Grey = 507C and #32 Dark Battleship Grey = 507A (B really) it will have been the purer grey pre 1933 and 1936 versions of 507C and 507B respectively as the #31 and #32 remain unchanged through all the editions of BS381C 1931- 1944 inclusive whereas the mix for 507C and 507B changed twice before WW2 making them slightly more blue in 1933 and 1936. It is in the 1948 edition that #31 becomes #631 and is given a new name "Light grey", #32 becomes #632 and renamed Dark Admiralty Grey, the colour of both still unchanged from 1931, and #697 is introduced as a new creation named Light Admiralty Grey but is in fact distinctly light blue. #697 is certainly not the wartime or pre war 507C.
#632 when made up in a paint shop has blue tint in it but not #631. That sounds like the colour comes from a time when 507B had blue pigment/paste but 507C did not. The 1920s?
Talking of timelines and post war, there are several Australian CNOs with 597B and C in them up to 1963
CNO dated 1960 which is adoption of an RN AFO 2126 1960 listing patterns with their numbers changed being: Paste, blue black, for dark grey paint, pattern 507B, in 28-lb. keg from 370A to 3574 Paste, blue black, for dark grey paint, pattern 507B, in 7-lb. tin . from 370A to 3575 Paste, blue black, for light grey paint, pattern 507C, in 28-lb. keg from 371 to 371 Paste, blue black, for light grey paint, pattern 507C, in 7-lb. tin . from 371 to 3577
Another CNO quotes AFO 1995 1961 with new number as below: 507B Paint, oil based, dark grey 10667 507C Paint, oil based, light grey 10668
Another CNO quotes AFO 1671 1963: 3574 Paste, blue black, for dark grey paint Patt. 0442/10667, in 28-lb. shipment keg cwt. 3574 3574 Paste, blue black, for dark grey paint, Patt. 0442/10667, in 28-lb. trade keg lb. 473009 371 Paste, blue black, for light grey paint, Patt. 0442/10668, in 28-lb. shipment keg cwt. 371 371 Paste, blue black, for light grey paint, Patt. 0442/10668, in 28-lb. trade keg .. lb. 473010
So I wonder when did the RN stop holding stocks for these colours even though they had been replaced by newer colours? Could the older colours have been used for harbour craft or work boats?
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