Bar Code Label Quality
Spots and Voids
A spot (-1- in Figure 29) is an area within the white background in which reflectivity is less than 55%.
A void (-5- in Figure 29) is an area within the black element in which reflectivity is more than 20%.
Spots and voids are allowed, as long as the following conditions are met:
Reflectance and Contrast
The reflectance and contrast should be determined using a light source of nominal 670 nm wavelength with a bandwidth of no more than 50 nm for a 50% power level.
Incident irradiation should be normal to the surface and reflected flux collected within a 15 angle centered on the normal.
The minimum allowable reflectance of spaces is 50%.
The minimum allowable reflectance ratio of spaces to bars is 5:1.
Label Degradation after Exposure to Light
The ratio of space reflectance to bar reflectance should not fall below 4:1 after 30 days exposure to a fluorescent source of 100 foot-candles.
Please see the LEGAL - Trademark notice.
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