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Prussian blue pigment is significant since it was the first stable and relatively lightfast blue pigment to be widely used since the loss of knowledge regarding the synthesis of Egyptian blue. European painters had previously used a number of pigments such as indigo dye , smalt , and Tyrian purple , and the extremely expensive ultramarine made ...
Blue is used by the NATO Military Symbols for Land Based Systems to denote friendly forces, hence the term "blue on blue" for friendly fire, and Blue Force Tracking for location of friendly units. The People's Liberation Army of China (formerly known as the "Red Army") uses the term "Blue Army" to refer to hostile forces during exercises.
Prussian blue was developed around 1706. [6] It is on the World Health Organization's List of Essential Medicines. [7] As of 2016, it is only approved for medical use in Germany, the United States, and Japan. [8] [9] [10] Access to medical-grade Prussian blue can be difficult in many areas of the world including the developed world. [11]
Engineer's blue is prepared by mixing Prussian blue with a non-drying oily material (for example, grease).The coloured oil is rubbed onto a reference surface, and the workpiece is then rubbed against the coloured reference; the transfer (by contact) of the pigment indicates the position of high spots on the workpiece or conversely highlight low points. [1]
Prussian blue, a dark blue pigment containing iron and cyanide Prussian blue (medical use), the use of Prussian blue for medical treatment and diagnosis; Perls' Prussian blue, a stain used for medical diagnosis
The development of aizuri-e was associated with the import of the pigment Prussian blue from Europe in the 1820s. [ 1 ] [ 2 ] This pigment had a number of advantages over the indigo or dayflower petal dyes that were previously used to create blue.
According to Stahl, Dippel and the pigment maker Diesbach used potassium carbonate contaminated with this oil in producing red dyes. To their surprise, they obtained a blue pigment "Berliner Blau", also called "Preussisch Blau" or "Prussian blue". [3] There are claims that during his stay at Castle Frankenstein, he practiced alchemy and anatomy.
In Japanese, the word for blue (青, ao) is often used for colours that English speakers would refer to as green, such as the colour of a traffic signal meaning "go". In Lakota, the word tȟó is used for both blue and green, the two colours not being distinguished in older Lakota (for more on this subject, see Blue–green distinction in ...