Your image is of Measure 1.
The Pacific Fleet at Pearl Harbor was conducting considerable experimentation in 1941 with different colors and measures.
In September 1941, the current color schemes Measures 1 through 8 were abolished and four new schemes promulgated in a revised edition of SHIPS-2 but by the time of the Pearl Harbor attack most of the Pacific Fleet were still testing variations of Measure 1A using Sea Blue, later adopted as Measure 11, Measure 1B using Sapphire Blue and Measure 1C using Navy Blue, later adopted as Measure 21. Some ships were still wearing dark gray Measure 1
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UNITED STATES PACIFIC FLEET
BATTLESHIPS, BATTLE FORCE
U.S.S. MARYLAND, Flagship
CONFIDENTIAL Pearl Harbor, T.H.,
CLIPPER/ MAIL December 6, 1941
(pencilled note: Rec 15 Dec via Clipper Airmail)
Dear Commander,
This will give you some early information on the progress of our current experiments in camouflage painting in this Fleet, and perhaps enable you to act in advance of receipt of the official report, which will not be forwarded until late in January 1942.
The sapphire blue apparently will do all that is claimed for it, and is color fast. However, adherence is only fair to poor, and some slight gloss has developed upon weathering. If these two defects could be overcome, it might be the answer, at least as far as air observation is concerned.
The graded systems are definitely out. They are as visible from the air as light gray, as was expected from previous tests.
Indications to date are that Measure 11 of Ships 2, utilizing formula 5S, is too light. Cinclant’s "Navy blue" looks like a step in the right direction, and we are directing that one ship of each type be painted "Navy blue" to permit comparative service tests.
We have one destroyer painted "Navy blue", and from observations made thus far, it is possible that a color underway between "navy blue" and formula 5D might be required. If so, do you know of any objections to mixing 5TM and 5U in the proportions of 20 pints of the former to 5 gallons of the latter? It is possible that such a large proportion of tinting paste to untinted base may be detrimental to the adherence, resistance to weathering and other qualities of the mixed paint.
In closing, it is our opinion that it is very desirable that we undertake further tests of sapphire blue on at least one ship of each type at as early a date as the paint can be made available here by the Bureau.
Yours sincerely,
Copy: Comdr. D.H. Clark
Cincpac Material Officer. Richard Mandelkorn
Lt.Comdr. H. A. Ingram
Bureau of Ships,
Navy Department,
Washington, D.C.