Below, the manufacturer of fluorescent whitening agents will briefly introduce the use of whiteness meters:
1. Measure the blue light diffuse reflectance factor (R457) of the sample, which is called "blue light whiteness" or "ISO Brightness".
2. Analyze whether the sample material contains fluorescent whitening agents, and determine the fluorescence whiteness generated by fluorescence emission, that is, whitening.
3. Measure the brightness stimulus value Y10 of the sample, which is the green light diffuse reflection factor Ry.
4. Measure the opacity, transparency, light scattering coefficient, and light absorption coefficient of the sample.
5. Measure the ink absorption value of paper and paperboard.