| Summary: | 碩士 === 國立中興大學 === 森林學系 === 91 === Due to metamerism and specific peak lies in between 500nm and 600nm wavelength that is very sensible to human eyes for a dull green floral paper provided by a papermaker, so the optimum dye formulation is very difficult to obtain with the reflectance curve-aided color matching system. Miss Yue Yu was unable to match this dull green floral paper with spectrophotometer-aided color matching system (ΔE*<2.0) in 1991. However, by subtractive color mixing principle and our long-period experience in color matching, we suggested a dye formulation for dull green floral paper to be matched (ΔE*<2.0) as follows:
Pulp (30% NBKP + 70% LBKP, 450 mL CSF)1.70% Direct Yellow 12+1.80% Direct Sky Blue 5B+0.09% Direct Scarlet 4BS + 0.09% Basic Violet 10 2% Alum sheet forming (100gsm, CIEL*a*b* = 48.11/-9.37/13.97(standard)).
We also proposed a formula a*(L*/b*) on the similar a* value to evaluate the degree of green for various market green papers effectively.
The color of a typical paper can be expressed as lower a* (more negative) value with b* approaching to zero.
|
|---|
