The difference and application of blue and grey marks in textile color fastness testing

In textile fabric testing, the gray and blue standards for color fastness are two different rating criteria used to evaluate the ability of textiles to maintain color under various conditions (such as friction, washing, light exposure, etc.).They have different applications and evaluation methods.Here are the differences:

 

1. Grey Scale

The grey scale is mainly used to evaluate the discoloration and staining of color fastness.It is to judge the degree of color difference by comparing the tested sample with the untested sample.The gray scale consists of a series of gray levels, ranging from level 1 to level 5, indicating the severity of color difference.

 

Applicable scenarios: mainly used for evaluating color change and staining of color fastness.It is commonly used for testing washing fastness, rubbing fastness, and sweat fastness.

Classification: Level 1 to Level 5, the higher the value, the better the color fastness.

Grade 1: severe discoloration or staining

Grade 5: No obvious discoloration or staining

2. Blue Wool Scale

Blue Label is mainly used to evaluate the light color fastness of textiles.Blue Label uses a series of blue wool fabrics with standard colors, divided into 8 grades.The sample is exposed to light sources together with these blue samples, and after a specified exposure time, the color fastness to light is evaluated by comparing the degree of fading between the sample and the blue wool fabric.

 

Applicable scenarios: mainly used to evaluate the light fastness of textiles.It is usually used to test the fading of the color of the product under sunlight or ultraviolet radiation.

Grade classification: Grade 1 to Grade 8, the higher the value, the better the color fastness.

Grade 1: The lowest color fastness to light, easy to fade

Grade 8: The highest light color fastness, very stable color

Main differences:

Different evaluation objects: Grey scale is used to evaluate discoloration and staining, while blue scale is used to evaluate light fading.

The classification is different: the gray scale is divided into 1 to 5 levels, while the blue scale is divided into 1 to 8 levels.

Different application scenarios: Grey scale is often used for color fastness testing under daily conditions such as washing, friction, and sweat stains;Blue standard is used to evaluate color fastness under light.

In general, the grey label and blue label are used for evaluating the performance of textiles in different environments based on different color fastness evaluation standards.