Studis on the Evaluation Method of Detergency

Part 3: Trial Preparation of Private Gray Scale for Evaluation of Detergency

Abstract

Up to the present, the evaluation of the detergency has been mainly carried out concerning the soils on the white cloth.
However, concerning the soils on the dyed cloth, at present, the quantitative information has not become clear. This is why the evaluation by Harris' detergency which has been used generally are not appropriate.
Therefore, in order to express the detergency based on the visual evaluation, regardless of the white or dyed cloth, an attemption has been made to prepare the private gray scale for detergency corresponding to the gray scale for color fastness determination.
When this private gray scale was prepared based on N_D value with α= 1.5, ω= 1.54, this scale coincided fairly with visual evaluation. Then, when the achromatic specimens were evaluated by using this gray scale, the visual evaluation resulted with ease and the value corresponding to the gray scale grade were obtained.
But, in the visual evaluation, there are unavoidable difference among individuals. Therefor, an instrumental measurement are required to get the accurate and stable evaluation.
The trial preparation of the private gray scale for detergency in this experiment are considered to be an intermediate step to more accurate evaluation of detergency.