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Scheele's Green: yellowish-green pigment commonly used during the early to mid-19th century (AsCuHO 3) Paris Green: It was manufactured in 1814 to be a pigment to make a vibrant green paint; Cadmium pigments. Cadmium green: a light green pigment consisting of a mixture of cadmium yellow (CdS) and chrome green (Cr 2 O 3). Chromium pigments
Parma violets belong to the more exotic branch of the violet family. First appearing in Italy, in the 20th century, most types of parma violets have lavender flowers of varying sizes, which have an attractive fragrance. The origins of the parma violet are unknown, though they have been shown to be derived from two different Viola alba strains ...
The petals of violets have long been used in herbalism for their medicinal properties, even mentioned by Dioscorides. [3] "Violet tables", sugary lozenges flavoured with violets, were made before 1620. [4] During the 18th century, crushed violet petals, rosewater, and sugar were combined to make an early type of confectionery known as flower ...
Crystal violet lactone ( CVL) is a leuco dye, a lactone derivate of crystal violet 10B. In pure state it is a slightly yellowish crystalline powder, soluble in nonpolar or slightly polar organic solvents . The central carbon in the leuco form is in a tetrahedral configuration, with four covalent bonds . In an acidic environment, the lactone ...
Food coloring. A variety of food colorings, added to beakers of water. Food coloring, color additive or colorant is any dye, pigment, or substance that imparts color when it is added to food or beverages. Colorants can be supplied as liquids, powders, gels, or pastes. Food coloring is commonly used in commercial products and in domestic cooking ...
Viola is a genus of flowering plants in the violet family Violaceae. It is the largest genus in the family, containing over 680 species. Most species are found in the temperate Northern Hemisphere; however, some are also found in widely divergent areas such as Hawaii, Australasia, and the Andes. Some Viola species are perennial plants, some are ...
Three years ago, as the long-struggling Citigroup was in a tailspin over a billion-dollar fat-finger error, the bank announced its next CEO, Jane Fraser.
Transformation between leuco and colored form induced by ultraviolet radiation, photochromism. A leuco dye (from the Greek λευκό leuko: white ) is a dye which can switch between two chemical forms, one of which is colorless. Reversible transformations can be caused by heat, light or pH, resulting in examples of thermochromism ...
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