Abstract
From the result of the estimation of the colour change from dry cloths to wet ones by the colour depth value (C*), the authors introduced the next equation in the previous report.
Cw*=a (CD*-p) 2+q
where, Cw*: colour depth value in wet state,
CD*: colour depth value in dry state, and
a, p, q : constant determined by the kind of fibers.
In this report, the authors continued to investigate these colour change by means of HC*B* colourimetric system and found that, though the changes in hue (H) and brightness (B*) were very small, the change in value (V) was almost the same rate in various specimens.
HD≅Hw, BD*≅BW*
Vw≅VD-ΔVo
where, ΔVo: decrease of value by wetting the original dry white cloth.
Thus, it was found that the chroma (CW) and the colour depth value (CW*) of wet cloths could be calculated by the following equations through the measurement of the colour in dry state.
CW=BD* {10- (VD-Vo) } /10
CW*=21.72×10CWCw⋅tanH/2Vw/2
Conversely, the colour of the cloths in dry state can also be calculated from the measurement of colour of cloths in wet state. Therefore, in the case of colour mathcing in dyeing, it seemed to be possible that the colour of dry cloths is predicted with considerable accuracy from the immediate measurement of wet cloths before drying.
