American Society for Testing and Materials (ASTM). Current edition approved June 1, 2005. Published June 2005. Originally approved in 1990. Last previous edition approved in 2000 as E 1360 – 90 (2000). 15 p. This practice provides a means for specifying the colors of objects in terms of the Optical Society of America Uniform Color Scales. Both computational and visual methods are included. The practice is limited to opaque objects, such as painted surfaces, viewed in daylight by an observer having normal color vision.