Paper: It’s a Question of Brightness

Moreover, controlled conditions and standardization are lacking when it comes to the characteristics of the filters, the light sources (that is, a light’s UV content at the moment of measurement), the direction of the light, the mode of observation, etc.

Ambiguous results present a predicament for every paper specifier selecting product based on the convenience of a brightness measurement. Without knowing the degree of FWAs, the measurement process and the instrumentation used, how can you fairly judge different papers simply by a brightness number? The simple answer is that you can’t.