SDCE Light Fastness Standards 1 to 8, each pattern 15×25 cm
These are a series of 8 wool fabrics dyed with specified blue dyes to give blue wool cloths ranging from very low lightfastness to very high lightfastness. This forms a numerical scale of 1 to 8, where 1 has the poorest lightfastness and 8 has the best lightfastness. This allows fabrics to be graded, using a grayscale for change in color, for correlation with performance in use. This is used to predict the suitability for a given end use; typically apparel would be a minimum of grade 4, whilst furnishings would require a grade 6. They are used in the ISO 105 B series of tests and can be used in conjunction with the humidity control fabric for machine calibration.

SDCE Humidity Control Fabric
This is an azo-dyed cotton fabric with specified fading properties, which vary with the amount of relative humidity.