darkening
71Optical mark recognition — (also called Optical Mark Reading and OMR) is the process of capturing human marked data from document forms such as surveys and tests. Contents 1 OMR background 2 OMR software 2.1 Open Source …
72Color theory — For the American electronica/synthpop musician, see Color Theory. In the visual arts, color theory is a body of practical guidance to color mixing and the visual impacts of specific color combinations. Although color theory principles first… …
73John Clute — John Frederick Clute (1940 ) is a Canadian born author and critic who has lived in Britain since 1969. He has been described as an integral part of science fiction s history. [Matthew Davis, [http://www.strangehorizons.com/2006/20060918/yakfests… …
74Photographic filter — Four photographic filters. Clockwise, from top left, an infrared hot mirror filter, a polarising filter, and a UV filter. The larger filter is a polariser for Cokin style filter mounts. In photography and videography, a filter is a camera… …
75Melanocyte-stimulating hormone — proopiomelanocortin (adrenocorticotropin/ beta lipotropin/ alpha melanocyte stimulating hormone/ beta melanocyte stimulating hormone/ beta endorphin) Identifiers Symbol POMC Entrez 5443 …
76Insulated glazing — (IG) also known as double glazing are double or triple glass window panes separated by an air or other gas filled space to reduce heat transfer across a part of the building envelope. Glass in windows is used to provide light and allow a view… …
77Lead glass — Swarovski flacon. Lead glass is a variety of glass in which lead replaces the calcium content of a typical potash glass.[1] Lead glass contains typically 18–40 weight% lead(II) oxide (PbO), while modern lead …
78Christopher Priest (novelist) — For other people of the same name, see Christopher Priest (disambiguation). Christopher Priest Born 14 July 1943(1943 07 14) Cheadle, United Kingdom Occupation Writer Nationality British Ethnicity …
79Peppered moth evolution — This article is about the peppered moth s significance in evolutionary biology. For its evolutionary ancestry, see Insect evolution. Biston betularia f. typica, the white bodied peppered moth …
80Iron gall ink — Oak galls and iron(II) sulfate, ingredients of iron gall ink Iron gall ink (also known as iron gall nut ink or oak gall ink) is a purple black or brown black ink made from iron salts and tannic acids from vegetable sources. It was the st …
