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lightfastness rating watercolor

Looking only at the pigment ingredients, watercolor paints come in three basic types: single pigment paints, convenience mixtures, and hue mixtures. Only tests actually done on watercolors can guide your pigment selections. Risk from Skin Contact. We agree that this does not make intuitive sense, and certainly other respected authorities – such as Bruce McEvoy’s website Handprint ( https://www.handprint.com/HP/WCL/waterb.html ) – has found Phthalo Blues to perform quite well. The colours on the labels are screen printed with the watercolour in this undertone, using a screen printing technique developed specially for Old Holland.". In terms of the specific colors you are interested in, PR 264 has tested consistently in oils as equivalent to ASTM LF I. The instrument of choice is a xenon arc fadeometer or weatherometer (brand names vary), which can measure precisely the amount of illuminant energy the sample has received and can be programmed to cycle through alternating periods of light and dark, usually for a total exposure equal to 1000 hours of sunlight exposure. Unfortunately, though many high quality pigments are manufactured in Europe, Japan and the USA, the environmental consequences of industrial pigment manufacture are increasingly being exported to the Third World (China and India in particular), whose environmental laws and enforcement are of a different kind. In fact, these are standard manufacturing details described to make them sound special. A Brief History of Lightfastness. Instead, they would only be required to look up the pigment on the ASTM pigment table and report that. ", Set aside the suggestion that you might be painting while riding a horse, and focus on the proposition that you catch a piece of rich and colorful history by purchasing a tube of paint. (What exactly is an impure, inauthentic, nonmineral pigment made from crushed rocks?) I see in a reply that we are open to asking for specific pigments! As an artist and consumer, you should be skeptical of published lightfastness ratings, whether of the permanency of a generic pigment, or the permanency of a specific brand of watercolor paint. But what you really pay for is the pigment powder, because pigments create the color. The one color that was not in line with our expectations, especially given its extremely long history as a reliable color in both oils and acrylics, was Hansa Yellow Medium (PY 73). Unlike the „quick” xenon test, this test can last from 2 to 2,5 years, depending on the actual amount of solar radiation. Nowhere else are exotic marketing names and picturesque stories used more consciously and skillfully than in the Daniel Smith mail catalog or web site. Phthalocyanine, diarylide, isoindolinone, benzimidazolone, anthraquinone, pyrazoloquinazolone, anthrapyrimidine, quinophthalone ... these are technical words that paint manufacturers almost always translate into something less forbidding. Yet even here, as the authors of books or articles that mislead, the primary responsibility rests with the artists. Look it over, and absorb what you can. Is honey from the Alps really a better humectant than honey from Spain or France? Schmincke designs its tests to reflect the environment in which the colours will be used. Using the color index name, you find that one is made of three ingredients, the other of a completely different single pigment that almost every other paint manufacturer calls by its common name, viridian. In each of these three cases — single pigment, convenience mixture or hue mixture — the paint manufacturer is free to give the paint whatever marketing name it deems appropriate. And how specifically is paint milled with stone rollers superior to paint milled with the standard metal rollers (beyond the mere claim that "old ways are better")? As a source of energy, light can cause color and chemical changes in many pigments. For now, at least, the testing of the Dioxazine Purple in QoR looks quite solid. The principal risk with watercolor paints arises from swallowing them, and this most often happens when brushes are "pointed" or shaped with the lips or mouth while still wet with a toxic pigment. The realization comes if we browse over to the oil paint section: "Oil paint has a special place at Old Holland. Field documented that many pigments then in use, especially those made from vegetable matter, were fugitive. Buying premixed paints is not usually an advantage over buying the pigments as separate paints, because premixed paints can hide flaws in the quality of individual pigments, and because the convenience paints are often modified by the artist anyway. Because most artists have been trained under the "color theory" dogma that paints are just "colors", even knowledgeable artists or authors such as Michael Wilcox, Charles Reid, Susanna Spann, Jim Kosvanec or the late Zoltan Szabo do not always keep the distinction clear between pigments (colored powders), paints (mixtures of pigments and liquid vehicle) and "colors" (the product names given to paints).

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