NIVO

NIVO, abbreviated from Night Invisible Varnish Orfordness (or "Night Varnish Orfordness"),^[2] was a dark grey-green overall finish applied to British night bomber aircraft in the inter-war period (1918–1939).

NIVO-finished Vickers Vimy serial F8614 at the RAF Museum London

NIVO
Colour coordinates
Hex triplet	#404735
sRGBB (r, g, b)	(64, 71, 53)
HSV (h, s, v)	(83°, 25%, 28%)
CIELChuv (L, C, h)	(29, 12, 104°)
Source	Federal Standard 595[1]
B: Normalized to [0–255] (byte)

Developed in 1918 by the experimental station at Orford Ness, as a low-visibility colouring for the Royal Air Force it had a sheen to match that of open water on a moonlit night.^[3]

It was applied to aircraft from 1918 and was used on the Vickers Virginia, Handley Page Hyderabad, Handley Page Hinaidi, Handley Page Heyfords and Fairey Hendon bombers.

By the mid-1930s, tests had determined that the varnish was too reflective when searchlights were shone on it.^[3] NIVO was phased out in the late 1930s, and had been discontinued by the time of the arrival of the new British medium bombers – the Vickers Wellington, Handley Page Hampden and Armstrong Whitworth Whitley.

NIVO is covered by Federal Standard 595 colour FS:34096^[4][5]