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In the production of photographic prints, spotting is a type of retouching flaws in the finished print with specially made paints, dyes, pencils and pens. [ 1 ] White spots on gelatin-silver prints made from negatives are caused by dust adhering to the negative or paper during exposure.
A petechia (/ p ɪ ˈ t iː k i ə /; [1] pl.: petechiae) is a small red or purple spot (≤4 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries. [2] [3] The word is derived from Italian petecchia 'freckle', of obscure origin. [1]
Tetrachromacy is demonstrated among several species of birds, [2] fishes, [3] and reptiles. [3] The common ancestor of all vertebrates was a tetrachromat, but a common ancestor of mammals lost two of its four kinds of cone cell, evolving dichromacy, a loss ascribed to the conjectured nocturnal bottleneck. Some primates then later evolved a ...
Nummular eczema, also called discoid eczema, is a type of eczema rash that shows up in a distinctive round pattern. The rashes may be itchy, red and raised ovals, the AAD says, and there may be ...
Purpura (/ ˈ p ɜːr p jʊər ə / [1]) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [2]
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Most other mammals are currently thought to be dichromats, with only two types of cone (though limited trichromacy is possible at low light levels where the rods and cones are both active). [5] Most studies of carnivores, as of other mammals, reveal dichromacy ; examples include the domestic dog , the ferret , and the spotted hyena .
Step Three: Remove Streaks. Combine one part vinegar and one part water in a bowl. Dampen a clean microfiber cloth with the mixture and apply it to the glass, wiping it down well for a streak-free ...