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Verdigris
Green copper-based pigment / From Wikipedia, the free encyclopedia
Verdigris /ˈvɜːrdɪɡriː(s)/[1] is a common name for any of a variety of somewhat poisonous[2][3][4][5] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.[6]: 132 Once used as a medicine[7][8] and pharmaceutical preparation,[9]: 176 [10] verdigris occurs naturally, creating a patina on copper, bronze, and brass, and is the main component of a historic green pigment used for artistic purposes from antiquity until the late 20th century, including in easel painting, polychromatic sculptures, and illumination of maps.[10]: 414–423 [11] However, due to its instability, its popularity declined as other green pigments became readily available.[9]: 171 The instability of its appearance stems from its hydration level and basicity, which change as the pigment interacts with other materials over time.[12]: 637
Verdigris | |
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Hex triplet | #43B3AE |
sRGBB (r, g, b) | (67, 179, 174) |
HSV (h, s, v) | (177°, 63%, 70%) |
CIELChuv (L, C, h) | (67, 45, 187°) |
Source | |
ISCC–NBS descriptor | Brilliant bluish green |
B: Normalized to [0–255] (byte) |
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