Reference white

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Reference white is an ideal achromatic color without any color cast , which is used as a neutral comparison in color measurement . It is used to set the white level, the metrological 100%, in contrast to the black level, the zero.

As a real comparison measurement, measuring surfaces prepared with barium sulphate are mostly used. An important area of ​​application in light measurement technology is, for example, the integrating sphere or standards for colorimetry . Calibrated titanium dioxide with a rutile structure is also used as a useful substance , although it is no longer ideally white towards the ultraviolet . Also, magnesium has uneven remission , but was formerly used as a low-cost commodity.

In this context, “ideally white” means that there is no change in the degree of remission over the entire wavelength range of the required measurement . From this point of view, Teflon washers are particularly suitable for practical use . These have a high uniformity of remission over a wide spectral range. For the same reason, it can also be used to produce good gray standards .

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