Purple Platinum, Blue Gold?
ROCHESTER, N.Y., Feb. 1, 2008 -- A tabletop femtosecond laser has been used to change the surface properties of metals to reflect a specific color or combination of colors. Silver, platinum, gold, and other metals have been turned colors such as blue, gray, black, and purple. Chunlei Guo, the University of Rochester optical scientist who a year ago used intense laser light to alter the properties of a variety of metals to render them pitch black (See Ultra-Intense Laser Blast Creates True ’Black Metal’ ), has...