Industrial Coatings – A fascinating decoration 2

Patchwork might be good for quilts but certainly not for coated industrial goods. As many finished products consist of multiple components which are manufactured by different suppliers and at different locations, uniformity of color and appearance is crucial. Not only the paint batches need to be delivered with consistent quality, but also the production process of the finished product needs to be controlled.

Metamerism 1

It’s happened to all of us. We pick out a product in a store based on its color, only to get home and find that it doesn’t look like we first thought it did. That sweater that you thought was grey actually has a green tinge to it, or that perfect off-white paint color looks a little too yellow once you apply it to your walls. What’s going on? You may be experiencing an effect known as Metamerism.

different illuminants

Different light sources affect they way we see color. Photo Courtesy of BYK-Gardner.

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What is Metamerism? 3

Metamerism is a visual phenomenon which can be caused by a number of different factors. The result is that two samples may look the same under some conditions and different under others.

The most common cause of metamerism is that the pigmentation used to make a match is different than that found in the standard. The spectral curves are different even though the L*a* b* values are the same. The effect of different light sources reflecting off of the different materials results in a visual color difference between the two under some lighting conditions.

 

Illuminant metamerism occurs when a pair of materials appear to match when viewed under one light source, and then appear to mismatch when viewed under a second light source. Metameric pairs have spectral curves, that cross at least three times.In instrumentation the MI (Metamerism Index) is used.  Photo Courtesy of BYK-Gardner.

Illuminant metamerism occurs when a pair of materials appear to match when viewed under one light source, and then appear to mismatch when viewed under a second light source. Metameric pairs have spectral curves, that cross at least three times.In instrumentation the MI (Metamerism Index) is used.
Photo Courtesy of BYK-Gardner.

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