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Paint Color Metamerism

Moderator: harlanpudneyjr


Post 22 Nov 2005, 19:33

Posts: 94
Location: dryden, ny
SERVICE NOTICE
Paint Color Metamerism
We have encountered several units that we have either done partial paint OR installed fiberglass luggage boxes and painted them only to have the units delivered to our customers and receive phone calls that the customer has the unit in their shop under bright florescent lights and our painted surface is “greener” than the rest of the unit, but when outside in natural sunlight the color is a perfect match. This is a phenomenon known as metamerism.
IN THE AUTOMOTIVE AND COMMERCIAL REFINISHING SECTOR THE LIGHT SOURCE USED FOR COLOR MATCH INDUSTRY WIDE IS NATURAL SUNLIGHT.
Sample metamerism: When two color samples appear to match under a particular light source, and then do not match under a different light source this is "sample metamerism." One can conclude that the spectral reflectance distributions of the 2 samples differ slightly, and their plotted reflectance curves cross in at least 2 regions. By illuminating them with lights with consideralby differing spectral power distributions you can witness and even exaggerate the visual differences between the 2 samples. The example below is how most remember this is the most commonly experienced form of metamerism.
Example: most people have experienced sample metamerism when putting on two socks that appeared to be black while in the bedroom (which may have incandescent lights), but later finding that one is black and the other is blue upon stepping into the kitchen (which may have fluorescent lights). The differences in the wavelength distribution between the incandescent and fluorescent lights interact with the differences in the spectral reflectance curves of the socks to make them appear the same in one light source and different in another.
Explanation: Incandescent light bulbs contain relatively little light in shorter (blue) wavelengths, and thus it would be more difficult to distinguish blue colors in such lighting conditions. The fluorescent illumination in the kitchen emits more short-wavelength light, and thus the dark blue can be more easily distinguished from black. In incandescent light, the socks are a "metameric match"; in fluorescent light, they do not match.
Our paint vendor Kimbers, Inc. has worked with New York Bus Sales, LLC. and their supplier, Dupont, to address this and we are confident that we have minimized this effect although it might still be seen when units are in florescent light as compared to natural sunlight.
AS ALWAYS SHOULD YOU HAVE QUESTIONS PLEASE DO NOT HESITATE TO CALL US!

CHITTENANGO 800-962-5768
HENRIETTA 800-463-3232
ALBANY 866-867-1100

THANK YOU
NEW YORK BUS SALES, LLC.

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