ASTM E Calculating Yellowness and Whiteness Indices from Instrumentally. Measured Color Coordinates. This practice provides numbers that correlate. Yellowness indices are used chiefly to measure these types of degradation. Yellowness Index per ASTM Method E is calculated as follows. To begin the ASTM D is a now obsolete Yellowness Index specification that is locked to calculate only using C/2 (illuminant C, 2deg.

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Need help or have a question? Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Global Gateway Please select your desired language. It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width. Comparable values between two instruments can be obtained only when both are measured with the same light. The color deviation number Tw shows additionally, if there is a red hue negative value of Tw or a green hue positive value of Tw.

The ISO brightness value indicates the blue reflection of the e3113. This practice provides recommended equations for such scales and discusses their derivations and uses, and limits to their applicability see also Ref 1 2.

Standard illuminant D65 must be used for measurement of optically lightened papers. The optical lightener is effective only due to the UV radiation.

Whiteness and Yellowness Indices in a SpectroEye

This test is most commonly used to evaluate color changes in a material caused by real or simulated outdoor exposure. Some standards addressing the visual estimation of color and color difference are Practices E3113DEand Eand Guide E Send us a request Wilton UK: Its derivation assumed that, because of the limitation of the concept to yellow or blue colors, it was necessary to take account of variations in the amber or red colorimeter readings.


It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. White textiles, paints, and plastics are a few of the materials that can be described by the indices of yellowness or whiteness calculated by this practice.

Through our network of over 43, people in 1, laboratories and offices in countries, Awtm provides quality and safety solutions to a wide range of industries around the world. The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener. Whether your business is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around the world.

Yellowness Index (YI) ASTM E313

It can also be applied to materials other than plastic fitting this description. However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen.

Send us a request Need help or have a question? CIE Whiteness — Some disadvantages of the previously-mentioned indices is that a whiteness that is calculated with this formula does not differ if the measured sample has a color drift or is just less white. Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.


In general, specimens should be prepared and presented for measurement in the manner that is standard for the test being performed. For near-white specimens, however, it is often useful to calculate single-number scales of yellowness or whiteness.

Whiteness and Yellowness Indices in a SpectroEye

Multiple samples should be measured and the readings averaged. No other units of measurement are included in this standard. Historical Version s – view previous versions of standard Translated Version s: Yellowness Index is a number calculated from spectrophotometric data that describes the change in color of a test sample from clear or white to yellow.

Standards asmt be obtained from appropriate standard authorities. It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role. Historical Version s – view previous versions of standard.

Yellowness Index (YI) ASTM E

This method is based on the use of colorimeter readings B and G. Values greater than indicate a bluish white, while values less then indicate a yellowish white. For whiteness measurement, this practice is limited to specimens having Munsell value greater than 8. Because visual observing conditions can vary widely, users should compare calculated indices with visual estimates to ensure applicability.