- The GB-T 250 standard is based on ISO 105-A02.
- The GB-T 251 standard is based on ISO 105-A03.
The ISO Grey Scales are wholly compliant with GB-T standards.
To order (stock code):
- ISO 105-A02 Assessing change in colour (766-200)
- ISO 105-A03 Assessing Staining (766-201)
A PDF version of this FAQ is available for reference.