While several of the Windsock Datafiles have color information on German Underside Light Blue (and there's already a thread on the topic), the datafile on the Fokker Triplane lists a slightly different color: Underside Turquoise. Was this just an early sampling of the same underside color, or was a unique underside color used only on the Triplanes? In any case, the Methuen references are close...but slightly different, as outlined below.
The usual caveats: As always, there was frequently variation in paint color, weathering, varnishing, etc., so this is just a general guide. Unless you've got a high-end, wide-gamut monitor in perfect calibration (and who does?), do not trust the colors you see on your monitor! Instead, visit your local paint store and see if you can find paint samples like the ones listed below and then match your hobby paints or mixes against those. The goal is just to "get close". See 'Color: why we'll never get it exactly right'.
Entries with an asterisk (*) are excellent matches; entries with question marks (?) have not been formally measured with a color meter and are therefore unconfirmed; entries with (~) are not a great match but they are adequate.
Source: Windsock Datafile 5: Fokker Dr.I
German Underside Turquoise Fokker Dr.I Methuen/CIElab House Paints and Standards Hobby Paints
80.84,-15.98,-4.72
WD5Beauti-Tone Outerspace C14-5-0686-0
Behr Wave Top M450-3 *
Benjamin Moore Waterfall 2050-50 *
Dulux Seawind 90GG 66/157
NCS1950 S 1020-B50G **
Pantone 7464 C, 7464 U *
RAL Design 200 80 15 *
RAL Effect 730-2
Sherwin-Williams Spa 6765
Valspar Crystal Aqua 5006-7B? Vallejo Model Color 70.971 Green Grey ?
75.56,-18.26,-2.99
between the twoBeauti-Tone Stillwater C14-4-0687-0
Behr Spring Stream PPU12-7
Benjamin Moore Hazy Blue 2040-50 *
BS5252 15 D 41- Green
Dulux Aqua Chintz 90GG 57/146
NCS1950 S 2020-B70G
RAL Classic Lichtgrün 6027
Sherwin-Williams Raindrop 6485
Valspar Gentle Wave 5007-7C? Vallejo Model Color 70.973 Light Sea Grey ?
68.54,-21.9,-0.34
WD5Behr Mild Evergreen MQ6-37 *
Benjamin Moore Juneau Spring 2041-40
Dulux Capri Pants 50GG 43/213 *
Little Green LG93 Turquoise Blue **
RAL Design 180 70 20 *
Sherwin-Williams Cooled Blue 6759
Valspar Woodland Charm 5008-8ATBD
Color matching with 1989 Methuen Handbook of Color and Nix Color sensor
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