Materials and surfaces can be made fluorescent by admixing optical brightening agents (OBAs). Optical brightening agents are fluorescent substances that absorb light in the UV wavelength range from 300 to 390 nm, and emit it in the adjacent...

Comply with colour viewing / measuring geometry 0/45 or vice versa. If necessary, use sample holders to provide the correct geometry. Put samples close together. If possible, colour samples should have the same dimensions Ambient conditions...

Metamerism occurs when two colour samples appear equal under one viewing illuminant, but look different with another light. Note the substrates must also be assessed by CIE-illuminant A (incandescent lighting). In the illustrated example, b...

In order to standardise not only the viewing environment but also factor human, special requirement are placed on the observer. The observer must be perceive colour normally and should have experience in colour comparison as well as a good...