National Physical Laboratory

Reflectance Standards

NPL can provide and has helped to develop a range of different reflectance standards.

There are a variety of samples available:

Ceramic tiles

100 mm square or 50 mm square, glossy or matt finish.

Ceramic Colour Standards Set

12 tiles - 3 neutral grey, 7 coloured (deep pink, red, orange, yellow, green, cyan, deep blue) and 2 colour difference (grey and green)

Neutral tiles White, black and grey
Metameric colour difference tiles A pair of ceramic tiles designed to appear similar in colour in daylight (D65), but different under tungsten lighting (Illuminant A)
Low thermochromism tiles These tiles are less prone to changes in colour with temperature than normal coloured tiles (however, they are also less saturated)
Holmium tile The reflectance curve of this reflective wavelength standard contains a number of absorption peaks, which can be used for wavelength and bandwidth investigations. The tiles also give striking colour changes between some light sources.

Other reflectance standards

White Russian Opal

Unlike the colour-glazed ceramic tiles, this standard is flat polished pot opal 50 mm square. It gives a higher reflectance in the visible part of the spectrum than the ceramic white tile and can also be used in the UV.

PTFE reflectance standards such as Spectralon® White, a range of neutral grey values and black standards are available. These standards are typically 50 mm diameter and have a matt finish. They have a flatter reflectance profile in the UV and near-infrared.
Front surface mirrors 50 mm square, silicon dioxide over-coated aluminium front surface mirror. The coating protects the aluminium from degrading and can be cleaned with care. Can be used from 200 nm to 2500 nm.

Contact us for further information

Call the Instruments team on: 020 8943 6539

Last Updated: 10 Apr 2017
Created: 6 Aug 2009


Please note that the information will not be divulged to third parties, or used without your permission