What is BS EN 3475-705- Contrast measurement about?           
BS EN 3475-705 specifies the process to be applied for measuring the contrast of wire and cable identification markings against the background of the unmarked wire insulation. It has been developed primarily to define a reproducible process of contrast value determination for use both to determine the intrinsic laser markability of wires at the time of manufacture or later and to enable electrical wiring systems manufacturers to ensure that the whole process of wire marking is carried out to the required standard.
BS EN 3475-705 has been prepared by the European Association of Aerospace Manufacturers (AECMA). BS EN 3475-705 covers the preparation of samples, apparatus, measurement, requirements, and method of measuring the contrast of wire and cable identification markings against the background of the unmarked wire insulation.
Who is BS EN 3475-705- Contrast measurement for?          
BS EN 3475-705 on measuring the contrast of wire is useful for:          
- Electric cables inspectors          
- Aerospace products manufacturers              
- Testing agencies involved in the inspection of aerospace products                   
- Quality control personnel for spacecraft products                
- Aeronautical engineers           
- Aerospace researchers         
Why should you use BS EN 3475-705- Contrast measurement?           
It is a requirement within the aerospace industry that all wires and cables within an aircraft’s electrical system are identified with a circuit identification code at regular intervals down the length of the wire. Various marking methods are used for marking these identification codes onto the surface of electrical wires or cables including ink-based and laser-based processes. The legibility of the markings is dependent upon the process used and the insulation medium. Minimum standards of contrast are required to facilitate the reading back of the identity codes. BS EN 3475-705 provides best practice guidelines on the test methods for appraising the flexibility of a completed cable and its bending aptitude in aircraft systems. BS EN 3475-705 helps create a reproduceable process to enhance product manufacturing and quality.  
