| 摘要 |
PROBLEM TO BE SOLVED: To provide a colored paper for easily, quickly and inexpensively measuring quantity of light without using any special equipment, presenting a given color fading relative to a given quantity of light in high reproducibility and enabling visibly discriminating color fading in accordance with quantity of light from a light source. SOLUTION: This paper for measuring quantity of light is obtained by incorporating a printing paper A made from 50 wt.% of L-BKP and 50 wt.% of N-BKP with each 0.5 wt.%, on a dry pulp basis, of CI. Acid Blue 90 and CI. Direct Blue 203 followed by carrying out a papermaking operation.
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