This part of ISO 105 specifes the requirement for a digital imaging system for use in the methods specifed in Annexes A and B for the determination of change in colour and staining by digital imaging techniques.This method is not suitable for assessment of colour fastness to light as described in the ISO 105 B series, as these standards do not use grey scales to assess the specimen.This part of ISO 105 describes apparatus, equipment settings and calibration for the assessment of- change in colour, and— staining.