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  2. Viola sororia - Wikipedia

    en.wikipedia.org/wiki/Viola_sororia

    Common Blue Violet (Viola sororia) color variant. 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 ...

  3. Viola cucullata - Wikipedia

    en.wikipedia.org/wiki/Viola_cucullata

    The purple violet is a low-growing perennial herbaceous plant up to 20 cm (8 in) tall. The leaves form a basal cluster; they are simple, up to 10 cm (4 in) broad, with an entire margin and a long petiole. The flowers are violet, dark blue and occasionally white. with five petals. The fruit is a capsule 10–15 mm (– in) long, which splits ...

  4. Light therapy - Wikipedia

    en.wikipedia.org/wiki/Light_therapy

    Light therapy, also called phototherapy or bright light therapy is the exposure to direct sunlight or artificial light at controlled wavelengths in order to treat a variety of medical disorders, including seasonal affective disorder (SAD), circadian rhythm sleep-wake disorders, cancers, and skin wound infections.

  5. Viola adunca - Wikipedia

    en.wikipedia.org/wiki/Viola_adunca

    Viola bellidifolia. Viola cascadensis. Viola adunca is a species of violet known by the common names hookedspur violet, early blue violet, sand violet, and western dog violet. It is native to meadows and forests of western North America, Canada, and the northern contiguous United States. [1][2]

  6. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    Wood's glass is a deep violet-blue barium-sodium silicate glass with about 9% nickel oxide developed during World War I to block visible light for covert communications. It allows both infrared daylight and ultraviolet night-time communications by being transparent between 320 nm and 400 nm and also the longer infrared and just-barely-visible ...

  7. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    Color theory, or more specifically traditional color theory, is the historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. [1] Modern color theory is generally referred to as Color science. While there is no clear distinction in scope ...

  8. Color symbolism - Wikipedia

    en.wikipedia.org/wiki/Color_symbolism

    Color symbolism in art, literature, and anthropology refers to the use of color as a symbol in various cultures and in storytelling. There is great diversity in the use of colors and their associations between cultures [1] and even within the same culture in different time periods. [2] The same color may have very different associations within ...

  9. Shades of violet - Wikipedia

    en.wikipedia.org/wiki/Shades_of_violet

    This is an accepted version of this page This is the latest accepted revision, reviewed on 30 September 2024. Varieties of the color violet Violet Spectral coordinates Wavelength 380–450 nm Frequency 800–715 THz Color coordinates Hex triplet #7F00FF sRGB B (r, g, b) (127, 0, 255) HSV (h, s, v) (270°, 100%, 100%) CIELCh uv (L, C, h) (41, 134, 275°) Source W3C B: Normalized to [0–255 ...

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