Optical and Colour

Smithers Rapra has the ability to measure the optical properties of materials and make detailed colour measurement.

Colour measurements are assessed against the CIE L*a*b scales which attribute numerical values to colour and therefore allows easy comparison of colours and/or  colour change. As detailed in the diagram below the L scale measures light vs dark, with the a scale measuring Red vs. Green and the b scale measuring Yellow vs. Blue.  

Standards and Accreditation 

Haze and Clarity measurements tend to be performed to ASTM D1003-07.