Vinces Road … A standard Blue Wool textile fading test card is also placed. The Blue Wool Scale measures and calibrates the permanence of colouring dyes. Average values for time as measured in the U.K for full strength ink is as follows :-. Labels passing BS 5609 have light fastness values over Blue Wool 6. Basket: Light Fastness and Weather Resistance. Direct comparisons of the Blue Wool Scale to the light fastness required to meet BS 5609 do not exist. The European version is part of the ISO standards, and it gets its name from the dyed blue wool fabric bands or swatches that are used to visually compare fading rates. Light fastness tests, using the Blue Wool scale as a reference, are carried out using a Xenon arc lamp as a light source. Watercolors, inks, pastels, and colored pencils are particularly susceptible to fading over time, so choosing lightfast pigments is especially important in these media. The scale consists of 8 different strips of wool, each dyed with a blue dye of differing lightfastness. Traditionally this test was developed for the textile industry, but it was later adopted by the printing industry as a measure of lightfastness for ink colourants. Light from the Xenon lamp has the nearest artificial wavelength distribution to that of the sun. The light-fastness is indicated on each as follows: *** = Maximum light-fastness = 7,8 Blue Wool Scale ** = Very good light-fastness = 5, 6 Blue Wool Scale * = Good light-fastness = 3, 4 Blue Wool Scale The blue wool card allows you to monitor the net exposure to light given to objects on display and to alert conservators to adjust intensity of illumination. The scale ranges from 8 (excellent – very low rate of fading) to 1 (very poor – extremely fast fading). The Blue Wool scale, of 1 to 8, uses samples of wool dyed with 8 different blue pigments each of which fade after different exposure times: 1 being the least resistant and 8 being the highest. The blue wool card allows you to monitor the net exposure to light given to objects on display and to alert conservators to adjust intensity of illumination. High resistance. Each textile fade card features pieces of wool cloth dyed with blue dyes of different degrees of fastness which are used as light fastness standards. Textile fading cards test for effects of light on paintings, documents and textiles with blue indicating scales. Blue Wool 4 –Up to 3 months. This forms a numerical scale of 1 to 8 where 1 has the poorest light fastness, to 8 which has the best light fastness. Two identical dye/pigment samples are coated out then one is placed in the dark as the control and the other is placed in the equivalent of sunlight for 3 months. How light fastness is measured? Testing is typically done by controlled exposure to sunlight, or to artificial light generated by a xenon arc lamp. Blue Wool Scale and the light-fastness of ink The Blue Wool Scale measures and calibrates the permanence of colouring. The Blue Wool standard relates to our star icons as follows: This standard utilizes eight scales to evaluate light-fast colors and it has been used for Artist paints for many years. Blue Wool 6 –Over 6 months. Blue Wool 8 –Exceptional – virtually no fade. Norfolk Some organizations publish standards for rating the lightfastness of pigments and materials. It is tested under museum conditions. Very Low resistance. The ISO blue wools are each dyed with a different dye giving rise to a light fastness scale which is an approximate geometric progression, ranging from 1 to 8. Traditionally this test was developed for the textiles industry but it has now been adopted by the printing industry as measure of lightfastness of ink colourants. Email: info@preservationequipment.com. The “Blue Wool Scale” is the internationally recognized method of quantifying lightfastness, defined under the British Standard BS1006. Each textile fade card features pieces of wool cloth dyed with blue dyes of different degrees of fastness which are used as light fastness standards. The test simply compares which blue pigment fades at the same time as the ink sample on test. "The Blue Wool Scale measures and calibrates the permanence/lightfastness of dyes and pigments Two identical dye/pigment samples are coated out then one is placed in the dark as the control and the other is placed in the equivalent of sunlight for 3 months. JMB cadmium pigments, like all cadmium pigments, have excellent light-fastness throughout the whole range from yellow to deep maroon. Moderate resistance. A few days down to a few hours in full sun. The typical conditions for ISO 105-B02 are: 42 W/m2 (300 – 400 nm)* 50°C BST; 40% effective humidity (use red azoic fabric to determine). Good resistance. IP22 4HQ, Tel: +44(0) 1379 647400 In addition the film weight of the ink applied can make a difference, as does the degree of white pigment within a given formulation. Very Low resistance. Fax: +44(0) 1379 650582 The Blue Wool Scale measures and calibrates the permanence of colouring dyes. Generally the time the ink takes to fade depends where in the world you are. These blue scale cards are manufactured in the UK exclusively for PEL to BS EN ISO 105-B08 which is the British and European standard for blue scale textile fading cards. Blue Wool 5 –Up to 6 months. Blue Wool 1 –A few days up to a week in dull conditions. The “Blue Wool Scale” is the internationally recognized method of quantifying lightfastness, defined under the British Standard BS1006. The lightfastness is indicated by the grades on the Blue Wool Scale: BWS 1 = poor BWS 5 = good BWS 2 = low BWS 6 = very good BWS 3 = average BWS 7 = extremely good BWS 4 = rather good BWS 8 = excellent The lightfastness values which we guarantee for are indicated on the labels on our tins and are established by the assessment of proof prints. On the "Blue Wool" scale, they range from 7 for yellows to 8 for oranges and reds. Blue Wool Standards For light and weathering fastness testing, our Blue Wools are individually dyed wool pieces, each with a different degree of fastness to light. Traditionally this test was developed for the textiles industry but it has now been adopted by the printing industry as a measure of "lightfastness" of ink colourants and also within the polymer industry for measurement of pigment & colour stability (lightfastness). The Blue Wool Lightfastness References were, and still are, aimed at those who work in the textile industry. We use cookies for essential functions and optimisation of this website. Hazard Warning Labels & Placards (Warning Diamonds), Limited Quantity & Environmentally Hazardous Labels, ADR Panels, ADR Plates, Hazchem Panels & Vehicle Marking, Dangerous Goods Notes & Dangerous Goods Declarations, Tactile Warning Labels (Tactile Triangles), Blue Wool Scale and the light-fastness of ink. A dull climate will be very different to a desert exposure in Africa.