A study on instrumental method for assessing colour fastness

传统的色牢度评定方法是采用两个灰度级对织物的色牢度进行视觉评定，其结果因观察者而异。本研究尝试了不同样品的目视评价的差异，并尝试了染色牢度、颜色变化、颜色深度变化的目视评价与仪器评价之间的关系，结果发现：1.以色牢度等值线为媒介，发现染色的目视评价与仪器评价之间存在一定的相关性.基于颜色深度的公式可能更适合于应用程序，以评估颜色空间中的染色距离。采用CIE94色差公式时，颜色变化的样本相关系数特别高.对CIE94色差公式的色度学性能进行了尝试性的研究.对于深度变化的试件，使用Nc#值和SEK等级时，相关系数特别高.在色深变化的情况下，根据色牢度公式进行的仪器评定效果较好，在色深变化的情况下，根据色差公式进行的仪器评定效果较好，并找出了三个国家的两种灰度等级的目视评定的差异今后，随着网上购物的发展，各国对色牢度评价的共同认识是必要的。我预计，评估将改为仪器的方法，而不是视觉评估，这是不同的国家不同。

The color fastness can be rated through visual assessment by using two grey scales.A result by the traditional method based on visual assessment various from observer to observer. An attempt has been made find out the difference of visual assessments by using various specimens.I have attempted to know the relationship between visual assessments and instrumental assessments for color fastness of staining, change in color, and change in depth of color.As a result, I have found out the followings.1. A rektionship between visual and instrumental assessment for staining have been found by the medium of color fastness contours.2. A formula based on color depth might be more proper for the application to assess staining as a distance in a color space.3. The correlation coefficient for the specimens of change in color was especially high when using CIE94 color difference formula.4. I have tried to investigate about the colorimetric performance of CIE94 color difference formula.5. The correlation coefficient for the specimens of change in depth was especially high for the specimens when using Nc#value and SEK grade.6. In the case of change in depth of color, the instrumental assessment according the color fastness formulae was much better, and in the case of change in color the instrumental assessment according the color difference formulae was better.And then I have found out the difference of visual assessment by using two grey scales from three countries(Japan, Thai and Hong Kong).In the future, with the Internet shop progresses, the common recognition for color fastness evaluation is necessary for every country. I anticipate that the assessment will be changed into the instrumental method instead of visual assessment which is different depending on different country.