Search results
Results from the WOW.Com Content Network
William Henry Perkin. Sir William Henry Perkin FRS (12 March 1838 – 14 July 1907) [1] was a British chemist and entrepreneur best known for his serendipitous discovery of the first commercial synthetic organic dye, mauveine, made from aniline. Though he failed in trying to synthesise quinine for the treatment of malaria, he became successful ...
The Color Purple is a 1985 American epic coming-of-age period drama film directed by Steven Spielberg and written by Menno Meyjes.It is based on the Pulitzer Prize–winning 1982 novel of the same name by Alice Walker and was Spielberg's eighth film as a director, marking a turning point in his career as it was a departure from the summer blockbusters for which he had become known.
Purple is a color similar in appearance to violet light. In the RYB color model historically used in the arts, purple is a secondary color created by combining red and blue pigments. In the CMYK color model used in modern printing, purple is made by combining magenta pigment with either cyan pigment, black pigment, or both.
The Color Purple is a 1982 epistolary novel by American author Alice Walker that won the 1983 Pulitzer Prize for Fiction and the National Book Award for Fiction.. The novel has been the target of censors numerous times, and appears on the American Library Association list of the 100 Most Frequently Challenged Books of 2000–2010 at number seventeen because of the sometimes explicit content ...
A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph . Mimeographs, along with spirit duplicators and ...
Two synthetic purple dyes were invented at about the same time. Cudbear is a dye extracted from orchil lichens that can be used to dye wool and silk , without the use of mordant . Cudbear was developed by Cuthbert Gordon of Scotland : production began in 1758, The lichen is first boiled in a solution of ammonium carbonate .
Tyrian purple (Ancient Greek: πορφύρα porphúra; Latin: purpura), also known as royal purple, imperial purple, or imperial dye, is a reddish-purple natural dye. The name Tyrian refers to Tyre, Lebanon , once Phoenicia .
Stroop effect. Naming the displayed color of a printed word is an easier and quicker task if the word matches the color (top) than if it does not (bottom). In psychology, the Stroop effect is the delay in reaction time between congruent and incongruent stimuli. The effect has been used to create a psychological test (the Stroop test) that is ...