Color triangle Color triangle A colour triangle is an arrangement of colours within a triangle, based on the additive combination of three primary colors at its corners. An additive colour space defined by three primary colors has a chromaticity gamut that is a color triangle, when the amounts of the primaries are constrained to be nonnegative. Before the theory of additive color was proposed by Thomas Young and further developed by James Clerk Maxwell and Hermann von Helmholtz, triangles were also used to organize colors, for example around a system of red, yellow, and blue primary colors. After the development of the
Ostravar Brewery Ostravar Brewery Ostravar Brewery () is a Czech brewery located in the city of Ostrava. Ostravar was founded in 1897 as a joint stock company in Moravská Ostrava, and the first beer here was brewed in 1898. In 1997 the brewery was acquired by Bass, after a merger with the company Pražské pivovary a.s, which also brews Staropramen. It is one of the few Czech breweries which produces a dry stout, branded "Kelt". For most of its history the beer was only sold locally around Ostrava and the Moravian-Silesian region. In 2016 the brewery opened its first restaurant, called "Ostravarna",