Thermochromism of ceramic color standards

A qualitative description of thermochromism in color measurements

“…This is because the spectral reflectance curves of neutral colors have a small or no slope. Similar results for color differences of reflectance standards were reported earlier by Fairchild and Grum 4 and Verrill et al 5 In addition to wavelength shift per nanometer and color difference per centigrade, a third measure also exists: relative change of the optical density of a sample as a function of wavelength. 6 However, leaving aside personal preference for a particular measure, the main point is how much the observed color depends on temperature.…”

A statistical analysis for correlation approach to compensate the measured CIELAB colorimetric data for temperature alterations

“…The results of this study suggested that care should be taken to make sure that the temperature of BCRA calibration standards remains constant during their use . In 1986, Verrill amended Fairchild's data using BCRA‐NPL Series II, and he claimed the new data had 5 to 10% less uncertainty if compare 20°C data with 35°C data . In 1997, studies conducted by Malkin revealed that colorimetric differences of BCRA‐NPL Series II color standards may serve as a function of temperature, using spectrophotometer with 0°/d, 0°/45° and 8°/t geometry .…”

“…6 In 1986, Verrill amended Fairchild's data using BCRA-NPL Series II, and he claimed the new data had 5 to 10% less uncertainty if compare 208C data with 358C data. 7 In 1997, studies conducted by Malkin revealed that colorimetric differences of BCRA-NPL Series II color standards may serve as a function of temperature, using spectrophotometer with 08/d, 08/458 and 88/t geometry. 8 In this research and another book by Verrill in 1995, 9 an assumption was made that it is possible to use the thermochromics data to correct for variations in temperature of the colored standards.…”

Thermochromism of fluorescent colors

“…Samples with spectral slope at longer wavelengths, such as yellow, orange, and red samples, are found to be affected most, leading to the largest color differences in the CIELAB color difference values, whereas gray samples usually show no clear thermochromism. The effect of thermochromism in nonfluorescent ceramic color standards has been reported by Compton, 3 Fairchild, 4 and Verrill et al 5 Recently, a mathematical model for thermochromism of nonfluorescent sample was published. 6 One of the main factors affecting the thermal behavior of fluorescent color samples is the chemical structure of the sample.…”