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 Post subject: Re: USAAF Olive Drab
PostPosted: Fri 17 Mar 2017 22:41 pm 
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Mikestarmer wrote:
Neither Humbrol 66 or 155 are even close to the correct colour, 66 is too dark grey-green and 155 far too light and brown.
There you go. "Far too light and brown." Get some Humbrol 155 and start painting! It ought to be a good match for a faded OD B-17.

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 Post subject: Re: USAAF Olive Drab
PostPosted: Sat 18 Mar 2017 10:02 am 
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Fascinating thread. There is also the element of "perception", which is different from the physics of "sight" and "colour". I am not (that) unusual, but each of my eyes Perceives colour in a different way, one with a slight bluish cast, one slightly pink.(Something to do with rods and cones, but to me that's ice cream while waiting for a perch to bite). Now my brain is obviously used to this, and offers me its best interpretation. However, this interpretation can change - I can see a "perfect match" between two swatches one day, but little in common the next. Perhaps this is because memory has its own input. I "remember" "Brunswick Green", but that memory itself comes from a whole range of sources.
Until colours are routinely specified and described in terms of light waves, then we are all, each and every one of us, interpreting them in our own unique way. No "right", no "wrong", just a melange of approximation.
I am reminded of this quote from Alexande Pope's "Essay on Criticism".
“Our judgments, like our watches, none
go just alike, yet each believes his own”

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 Post subject: Re: USAAF Olive Drab
PostPosted: Mon 20 Mar 2017 10:31 am 
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Read my previous mix for Humbrol paints. H66 and H155 are not even close to Dark Olive Drab No.41. If you wish a slightly more brown variant then either reduce the green by 1/2 unit or increase the H155 by the same factor. One point I should make here is that the mix is closely matched to a facsimile sample in an authoritative book.

But although this colour was 'standardised', the USAAC Material Division did not specify to the manufacturers precisely which pigments to use nor the ratios of them. Thus the various paint manufacturers used whichever pigments and mediums they carried in existing stocks to produce a colour as close to the standard as they could. We are talking here of thousands of gallons per company which meant lucrative contacts for the US Government. The resulting colour would be very close the the 'standard' but not exactly so, nor did it need to be. Material Division were not concerned by this, as long as the resultant colour was within certain acceptable visual limits according to their inspector and the chemical composition was compatible with other finishes in use. This is the reason that you have the variable tones on aircraft sub-contracted components when fresh from the final assembly line and the differing weathering properties after some months in service use. In some cases extreme, dependent on where in the world the aircraft was deployed.


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 Post subject: Re: USAAF Olive Drab
PostPosted: Mon 20 Mar 2017 14:52 pm 
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So in essence, a colour variation is 'official' !.
Combined with weathering and daily use the colour could in effect vary quite considerable from the official line so colour matching isnt then an exact science and the mixing process down to one's own interpretation.
I 'Thank you' for that clarification.

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