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Viola sororia is a short-stemmed, herbaceous perennial plant that grows in well-drained and shady habitats. [ 5] This 15–25 centimeters (6–10 in) wide violet has glossy, heart-shaped leaves and are topped with purple flowers with white throats. The lower three petals are hairy and the stem of the flower droops slightly. [ 7]
Natural dye. Naturally dyed skeins made with madder root, Colonial Williamsburg, VA. Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources— roots, berries, bark, leaves, and wood —and other biological sources such as fungi. [1]
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 ...
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 ...
The alliance is the latest venture for Kate in the realm of early childhood development, a cause that she has long held close to her heart. For over the past decade, much of her work as a member ...
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 ...
A pet corn snake in its hide. small1 via Shutterstock. 2. Corn Snakes. Size: 2-4 feet on average, potentially up to 6 feet. Lifespan: 15-20 years. Corn snakes are fearsome hunters of rats and mice ...
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 ...