[kurlannaiskos]

please pardon my late responce,I had to go digging for my color information.

my post earlier was from memory and contains an error :
Neutral Grey 43 is 4 parts black and 6 parts white.

according to an article written by Robert D. Archer for Great Scale Modeling (yearly issue from Fine Scale Modeler) based on his book
the official Monogram US Army air service & air corps color guide vol. 1
1908-1941 states :
"in February 1943 the US ARmy requested the USAAF Dark Olive Drab #41 be replaced by thelighter Olive Drab no. 319. the newer color is shownin the color card of the US Army Spec. 3-1 of April 1943"
(I do not have a color sample of this )
"when the new color standards were released, olive drab (ANA 613) was a compromise;it was a little darker than the US Army's 319, but lighter and browner than the USAAF's no.41
the document for the new ANA 157 paint standard was AN-E-7 dated Nov. 4 1943, but it was not recieved by manufacturers until December 1943"

Quarter Scale Modeler Volume 3 issue 3 page 19-21 has an article by Paul Lucas "Causing more Havoc : shades of Olive Drab"
"there is some evidence to suggest that the Spec 3-1 319 hue was applied to some aircraft, particularly C-47's, P-38's and B-17's
C-47's are especially interesting, as some aircraft appear to be finished in a combination of Dark olive Drab 41 and Spec 3-1 319 , both with and without,Medium Green 42 blotches;and with light grey undersurfaces. an example of a C-47 apparently finished in Spec 3-1 319 and light grey can be found on page 102 of Roger A. Freeman's "RAF of WW2 in color"

he goes on to list FS 595b color FS 14084 as the closest to OD 41 but with a matt finish he also lists FS 34088 as the closest match for Spec 3-1 319. Humbrol 155 is listed as the closest paint for models.
very unusually he lists no FS number close to ANA 613 but does mention
BS 381C 298 Olive Drab in British service as a modern equivelent of ANA 613

"Air Force Colors Volume 2 ETO & MTO 1942-1945" by Dana Bell states :
light grey 602 is somewhat darker than FS 36440 and ANA 620
sea grey 603 is greyer than FS 36118
olive drab 613 is substantially darker than and greener than FS 34087
light gull grey 620 : good match, 620 is slightly darker than 36440.

he makes no mention of Spec 3-1 319 olive drab, but lists an Army Corps of Engineers color Olive Drab #39 (wich I have no other reference on) as
"slighly greener than OD 613 ,substantially darker and greener thanFS 34087"
this only complicate matters and suggests there might have been four shades of olive drab in WWII.