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Shade and Opacity Meters

The measurement of darkness or lightness of a surface, shading is measured irrespective of colour and is referred to as “whiteness”.  The test surface is illuminated at an angle of 45° and the intensity of scattered light at 0° is measured on a grey scale, where black is 0% and white is 100%. 

The degree to which a coating hides the surface to which it has been applied is known as opacity.  Measured in a similar way to shade, opacity, (or hiding power), as defined by ISO 2814, involves measuring whiteness of a known film of test material on both a black (less than 5%) and a white (greater than 75%, less than 85%) substrate.

 
 
 

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