Gray Scales

Grey Scales
Before talking about any textile test or test method it is very necessary to have the knowledge about Gray scales.
Two types of gray scales are used below are the types and usage of them:

Grey Scale for Assessing Change in Shade
EN ISO 105-A03 / IUF 132 / VESLIC C 1211
This Grey Scale is for assessing the degree of change in shade caused to a dyed Textile fabric / yarn in color fastness tests. For example, the change of shade of wool and cotton fabrics in the washing fastness, perspiration fastness, etc.
The scale consists of nine pairs of gray color chips each representing a visual difference and contrast.
The fastness rating goes step-wise from:
Note 5 = no visual change (best rating) to Note 1 = a large visual change (worst rating).
The gray scale has the 9 possible values:
5, 4-5, 4, 3-4, 3, 2-3, 2, 1-2, 1.

It is now quite common to measure the Grey Scale change in color instrumentally. This is made using a suitable reflectance spectrophotometer according to the test method procedure,
EN ISO 105-A05.

Grey Scale for Assessing Staining
EN ISO 105-A03 / IUF 132 / VESLIC C 1211
This Grey Scale is for assessing the degree of staining caused by a dyed Textile / yarn in color fastness tests.
For example, the staining of wool and cotton fabrics in the wash fastness, perspiration fastness, etc.
The scale consists of nine pairs of gray color chips each representing a visual difference and contrast.
The fastness rating goes step-wise from:
Note 5 = no visual change (best rating) to Note 1 = a large visual change (worst rating).
The grey scale has the 9 possible values:
5, 4-5, 4, 3-4, 3, 2-3, 2, 1-2, 1.