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Impulse 1-2013-EN

page 8 | impulse | 1/2013 So your customers won't see red Preventing complaints through instrumental and visual colour analysis The glorious colours of a rainbow process examines which portions gO On and comes to the relationship between a material sample, establishingof white light are reflected bynever fail to delight us. When it relax, man! the over 350,000 shades that the eye. Depending on the nature of thecolour perception in the humansuppliers and customers, however, Concentration suffers human eye can distinguish regularly task, the experts at the Hohenstein when men’s ties are too cause trouble and arguments. Institute derive tristimulus tight complaints due to colour deviations degrees of whiteness from thevalues, colour chromaticities orAnd yet, the majority of Studies have found that up to 80 % could be avoided. spectral data according to different of tie wearers fasten the knot too internationally used formulas. Colour tightly, causing the loop to press ‘The use of instrumental differences between control and on the sensitive efferent blood and visual colour reference samples as well as pass/ vessels in the neck. This in turn fail characterisations can also be analysis can ensure that can cause increased pressure determined with this process. This inside the skull which affects the colour effect will applies to all types of textiles, glass and the well-being as well as the correspond to the target plastics as well as to paints, varnishes mental performance of the person values even on different and coatings applied to substrates. wearing the tie. materials and surfaces.’ Many companies supplement instrumental analyses for continuous The visual acuity of employees in quality Example for instrumental colour ‘Our psycho-physiological quality assurance with visual colour assurance is verified through the precise measurement. examination methods In many areas, however, there analyses. During this process, Farnsworth test. are no normative values which of poorly chosen clothing colour deviations. Accordingly it is under controlled lighting conditions. the type of colour vision deficiency, colour vision, there are no objectionsshows no serious deficiencies inred-green anomaly. Depending onCaution is advised, however:could be used to define acceptabledetect the exact effectsemployees evaluate the colour effect on humans by evaluating important to stipulate the acceptable the people affected are unable to to the visual sign-off. As eyes change their subconscious tolerances already during product distinguish between e.g. red and green with age, the tests have to be repeated physiological reactions.’ development and in the run-up to ‘Not all employees are hues. This is why the Hohenstein regularly. The test subjects can then large orders. These then have to be suitable for visual colour Institute offers a special eye test for spend many years ensuring that their Another effect can be increased ensured by using instrumental and evaluation due to their employees in quality assurance. The employers’ customers will only ‘see intraocular pressure which can visual colour analysis during the visual acuity.’ so-called Farnsworth-Munsell 100 red’ if this was clearly stipulated in result in glaucoma. Particularly production process in the sense of hue test requires test subjects to the order. on hot days and in heated, poorly best possible colour consistency. place 85 colour caps in the correct ventilated rooms, the effects Instrumental colour measurement Approximately 8% of men and order of hue according to the colour Sabrina Köhler of a tight-fitting shirt collar in uses a so-called spectral photometer around 0.5% of women are affected wheel. The Hohenstein experts run a combination with a tie that is to determine the spectral reflection by a colour vision deficiency. This computer analysis of any deviations s.koehler@hohenstein.de fastened too tightly can be fatal. of test samples. That means the usually manifests itself as a so-called from the ideal sequence. If the test www.hohenstein.de/pr-479-EN A pilot study by the Hohenstein Institute has now found clear indications that an overly tight tie can negatively influence a Wear comfort: very good person's attention. At a pressure of 40-60 mmHg between skin and shirt collar, the concentration of Targeted support for marketing clothing the test subjects decreased by up The Hohenstein Institute is one of the pioneers in the field of quantifying wear comfort, which is the interaction between the human body, the climate and the clothing worn. The thermophysiological aspects include thermal insulation and moisture management. They provide information about how well the textile will keep the wearer warm in Studies have found that up to 80 % of defined situations while storing sweat tie wearers fasten their knots too tightly. or wicking it away from the body. A pilot study showed that this reduces The wear comfort vote developed to 70 % within one hour. This even grading from 1 (very good) to 6 QUALITYproperties of textile materials. TheTestedwww.hohenstein.comby Hohenstein provides an overallstatement about the comfortconcentration which resulted in a clearlyincreased error rate for reaction andcoordination tasks. led to an 85 % increase in the error (insufficient) corresponds to the the same time, skin conductivity – explain the measuring results of .1WEAR COMFORT VOTE1TEST NO: HL 00.0.0.0000The wear comfort vote is based on independent laboratory testing and provides more transparency andcomparability for purchasing textiles.German school grading system,using basic formulas to clearly rate for solving computer-aided reaction and coordination tasks. At a subconscious stress parameter – increased by over 25 %. and the characteristic numbers At the point of sale the wear factor, antimicrobial effect or dirt- VERY GOODproperties such as UV protectionin protective clothing, for example.the laboratory tests. The parameters crucial to physiological comfort are comfort vote can be clearly repellent and odour inhibiting Marina Handel weighted differently depending on advertised by using the Hohenstein finishes. This provides the customers Silke Off m.handel@hohenstein.de the intended use of the test samples – Quality Label on the product, for with a comprehensive statement s.off@hohenstein.de www.hohenstein.de/pr-476-EN different formulas apply to functional example. The label can also be used about the quality characteristics of www.hohenstein.de/pr-471-EN sports clothing than to textiles used to test and certify other functional an item at a glance. * Jonas JB, British J. Ophtalmol. 2005


Impulse 1-2013-EN
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