|《EVER-COLORS》have been developed as the reference materials for measuring
diffuse reflectance. They have reputation of high and constant reliability and
reproducibility in the measurement.K. Ichimura and N. Okazaki confirmed that
EVER-WHITE shows an exceedinglyhigh reflectance Included Specular Component
Geometry, and that it is exceedingly stable showing no change in reflectance after
being exposed for totally 80hrs. to the ultraviolet irradiation of a carbon arc lamp of
Having very high stability of the reflectance. EVER-WHITE, EVER-BLACK and
EVER-GRAYS are of essential necessities for spectrophotometers and colorimeters
as well as chromaticity measurement.
Besides the non-colored series mentioned above, colored series which are very fresh
in tint such as EVER-BLUE(Code No.3869), EVER-GREEN(Code No.4808), EVER-
YELLOW (Code No.7153) and EVER-RED(Code No.1900)are also available from
Stability and reliability of all the EVER-COLORS are due to that they are in a solid
state. Consequently, their optical surfaces are cleanable to obtain everlasting
reproducibility of the measurements.
Above all, features of EVER-WHITE(Code No.9582) and EVER-BLACK(Code No.0005)
have been included in the report, SURVEY OF REFERENCE MATERIALS FOR
TESTING THE PERFORMANCE OF SPECTROPHOTOMETERSAND
COLORIMETERS, which was edited and published by C.I.E. (International Commission
on Illumination), Division 2, TC-13, in 1985.
K. Ichimura and N. Okazaki : A Comparative Study on Optical Characteristice of Commercial Standard
Reference Materials for Whiteness, read at Annual Meeting of Color Science Association of Japan, Kansai
Area, March 20, 1981.