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Crystalline quartz and some crystals such as CaF 2 and MgF 2 transmit well down to 150 nm or 160 nm wavelengths. [36] Wood's glass is a deep violet-blue barium-sodium silicate glass with about 9% nickel(II) oxide developed during World War I to block visible light for covert communications. It allows both infrared daylight and ultraviolet night ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Varieties of the color violet Violet Spectral coordinates Wavelength 380–450 nm Frequency 800–715 THz Color coordinates Hex triplet #8000FF sRGB B (r, g, b) (128, 0, 255) HSV (h, s, v) (270°, 100%, 100%) CIELCh uv (L, C, h) (41, 134, 275°) Source W3C B: Normalized to [0–255 ...
No. 6 (Violet, Green and Red) is one of the works implicated in the infamous Bouvier Affair. It was privately bought for €140 million by Dmitry Rybolovlev in 2014. [2] [3] [4] Rybolovlev is thought to have bought the painting via the Swiss dealer, Bouvier. Rybolovlev learnt that Bouvier had actually bought the painting (rather than simply ...
Only personnel with confined-space training are permitted to enter the tunnel system, comprising 2.76 miles (4.44 km) of inaccessible tunnel and 11.07 miles (17.82 km) of piping; 3.78 miles (6.08 km) of direct-bury piping in the ground; and 2.2 miles (3.5 km) of accessible tunnel and 12.27 miles (19.75 km) of piping. [114]