The Performance of Different Whiteness Formulas for White Papers

摘要

Whiteness is an important property to characterize the surface color. A lot of whiteness formulas are used to characterize the whiteness of the materials. However, the performance of these formulas for paper samples is unknown. In this paper, 38 paper samples [27 fluorescent whitening agents (FWA) samples and 11 non-FWA] were evaluated under 6 light sources, including 3 levels of CCT (3000, 5000 and 6500 K) and 2 levels of ultraviolet (UV) radiation (with UV and without UV), by 12 observers (6 males and 6 females) with normal color vision. And 7 whiteness formulas were used to evaluate the accuracy of whiteness formulas in predicting the whiteness of paper samples using STRESS factor. The results suggest that W_(CIE) and W_(Uchida) can predict the whiteness of paper samples more accurately.