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Black Widow (also known as a Black Widow Ultra in Europe) is a non-commercial open source project to design a paint mix for the base of a DIY projection screen. Anonymous DIYers responsible for popularizing Black Widow in the DIY community include Mechman Alternators (US), Wbassett (US) and Custard10 (EU). [ 1 ]
The United States Navy saying "haze gray and underway" refers firstly to the color "haze gray". Haze gray is a paint color scheme used by USN warships to make the ships harder to see clearly. [ 1 ] [ 2 ] [ 3 ] The gray color reduces the contrast of the ships with the horizon, and reduces the vertical patterns in the ship's appearance. [ 4 ]
Following the Weber–Fechner law, at the start of the 20th century human lightness perception was assumed to be logarithmic.In 1903, The New International Encyclopædia illustrated this concept by stating that given a black and white with a luminance ratio of 1:60 ( : ), the geometric mean had to be used to find the middle gray. [10]
Super black is a surface treatment developed at the National Physical Laboratory (NPL) in the United Kingdom. It absorbs approximately 99.6% of visible light at normal incidence, while conventional black paint absorbs about 97.5%. At other angles of incidence, super black is even more effective: at an angle of 45°, it absorbs 99.9% of light.
The Mindful Way Through Depression: Freeing yourself from chronic unhappiness, by J. Mark G. Williams, John D. Teasdale, Zindel V. Segal, Jon Kabat-Zinn. Guilford Press, 2007. ISBN 1-59385-128-6. The Mindful Way Workbook: An 8-Week Program to Free Yourself from Depression and Emotional Distress. by John D. Teasdale, J. Mark G. Williams & Zindel ...
The following conventions are used: Cognates are in general given in the oldest well-documented language of each family, although forms in modern languages are given for families in which the older stages of the languages are poorly documented or do not differ significantly from the modern languages.