Carbon black pigment full#

Measurements of innovative, deepest black coatings with very low reflection takes place at a lightness value of L* < 1 (Fig. Consequently, the so-called 'signal to noise ratio' changes with dark colors: The measurement signal decreases while the thermal noise, which is basically caused by electronic components, remains constant. While a white sample reflects almost 100 percent of the light emitted by the spectrophotometer, the proportion of reflected light becomes smaller and smaller with darker colors - as increasingly larger amounts of light are absorbed by the sample. It has always been the greatest challenge for a spectrophotometer to achieve repeatable and reproducible results on a black color. The challenge of color measurement for BLACK colors 3.1 Signal to noise ratio Blackness (M Y), Jetness (Mc) and Undertone (dM) are specified in international standards: ISO/DIS 18314-3 and DIN 55979.ģ. Undertone dM describes the amount of blue shade in case of positive values and the amount of brown shade in case of negative values (Fig.

The difference between the black value Mc and the black value M Y defines the hue of a black color, the so called Undertone (dM) (Fig. The black value Mc describes higher jetness, if there is a blue undertone and lower jetness, if the shade is more brownish. As the undertone of a black color has an impact on the visual assessment, the hue-dependent degree of blackness M Y needs to be calculated (Figure 1). It determines only the lightness of a sample without considering the colored undertone. The calculation for the Blackness value M Y is based on the Tristimulus Value Y and a 10° Observer (Fig. The hue-dependent degree of blackness is referred to as “Jetness” (Mc). For this reason, black with a blue undertone is often preferred in technical applications, such as for the topcoats in the automotive industry. Two samples with the same blackness (M Y) and different undertone (dM) can be perceived as different blacks, whereas the sample with blue undertone will be perceived as deeper black.

Carbon black pigment full#

A deep black color with a bluish undertone in the full tone is perceived as richer, darker and more brilliant than with a brownish undertone. Deep black coatings can have an undertone – bluish or brownish. The higher the absorption coefficient of a medium, such as a black coating, the higher is the achieved blackness value (M Y). Leading carbon black manufacturers promote carbon black pigments that absorb up to 99.98% of light. In general, black is a color that results from the absence or complete absorption of visible light. Definition of Blackness – Jetness indices