Abstract
Computations of N. B. S. units of color differences from C. I. E. specifications to control the dyeing properties of viscose-acetate union fabrics require so much time, that the simple inspection method should be considered.
The writers have found that color differences are given from the reflectances in a given wavelength on the spectral reflectance curve.
Blue colors in general use are chosen as a dye for the inspection method, because they have less MacAdam ellipse.
At first, the same three union abbrics are separately dyed by the Direct-color (Azin Briilliant Blue 6B conc.) or Acetate-color (Diacelliton Fast Brilliant Blue BF), and then the reflectance was determined in 480, 580, and 650mμ in turn for the undyed, direct-dyed and celliton-dyed fabrics.
Their reflectances of color difference are immediately obtanied as follows:
for the undyed fabric y=0, 56x1+1.11
for the direct-dyed fabric y=0.92x2+1.3 and,
for the celliton-dyed fabric y=0, 77x3+1.0
where y is the color differnce in MacAdam ellipse unit, x1 is (1-R480/R580)×100, x2 is R580, and x3 is R650, and R is reflectance in the subscript wavelengths.
