Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on WhatsApp (Opens in new window), Click to email this to a friend (Opens in new window). Everything – the mats, backing, spacers, foam board, even the adhesives should all be acid-free. So, how can you make sure you’re getting precisely the same colour? I remember the first time I walked into a big art store – I felt like a little kid on Christmas Day! Dyes and pigments are used for example for dyeing of fabrics, plastics or other materials and manufacturing paints or printing inks. So, what’s the big difference? I investigated many threads that included the terms “permanent”, “lightfast”, and “ASTM”. Practice for the Visual Determination of the Lightfastness of Art Materials by the User (ASTM D 5398) and Practice for the Visual Determination of the Lightfastness of Art Materials by Art Technologists (ASTM D 5383), available from: ASTM, 1916 Race St., Philadelphia, PA 19103, Copyright © 2015 Just Paint. The letter ‘P’ is followed by another letter to denote one of ten basic colour categories: ‘Y’ for yellow, ‘R’ for red, ‘O’ for orange, ‘V’ for violet, ‘G’ for green, ‘B’ for blue, ‘Br’ for brown, ‘W’ for white, ‘Bk’ for black and ‘M’ for metallic. Another name for this pigment is Manganese Red 2B. PG12 Napthol Green ASTM rating of IV Your email address will not be published. Colour swatch: Shows how the colour will look when painted out, so there’s no need to open the tube. Very good light-fastness Etchr Lab Series 1 is the least expensive and Series 5 is the most expensive. Method 2: Control the exposure period by inspection of the blue wool references, a batch of different samples only needs one set of blue wool reference, which can save the blue wool reference. In addition, the addition of many finishing agents, such as softener and anti-wrinkle finishing agents, will also reduce the light fastness of the product. True Cadmium Yellow is made from PY37, which is absolutely light-fast. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. More details coming soon! The photo-fading principle of textile dyes is very complex: the structure of the dye is destroyed mainly because the dye absorbs photons, is stimulated, and a series of photochemical reactions occur, which result in a color fades. The answer is: read the Colour Index Name. Here are a few exceptions: PB1 Victoria Blue not ASTM tested, Wilcox rating of V The commonly accepted light-fast rating system is the one from the American Society of Testing and Materials (ASTM). The binders, mediums and varnishes used in painting absorb UV light wavelengths, thereby protecting the pigments from damaging effects. Rochelle Aruti: I studied with a teacher for many years who sculpt... Michael Townsend: Hello Jerry. The ratings are: There’s a lot more to say and explore about watercolour properties, but we hope to have covered the essentials with this blog post. It is permissible to expose the specimens with the reference sample only and without the presence of blue wool references. PR81 Rhodamine Y not ASTM tested, Wilcox rating of V I'm reading this post while waiting for a large, wet wash of Winsor Newton Cobalt Blue (Lightfastness I) watercolor to dry. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. PY12 Diarylide Yellow AAA not ASTM tested, Wilcox rating of IV Newer Post. PY1 Arylide Yellow G not ASTM tested, Wilcox rating of V The stability of paint when exposed to ultraviolet (UV) light is generally discussed with a focus on the pigments in the paints. Neither is lightfast. fastness is. For the other fibers, select the dyes according to the effect on fading. Discover the three oil colours you need to create your own version of vermilion, and how to mix them to ensure vibrancy and opacity. Insisting on using only those paints whose pigments are rated good or excellent in light-fastness is the most important action you can take.