Blue-green glass

Note that some of the metals frequently encountered in simple organic compounds give characteristic flame colorations Na, yellow K, lilac through blue glass Ca, brick-red Ba, apple-green Cu, bright blue-green. Ag and Pb, no characteristic flame. 

The LB technique is amenable to the fabrication of ECDs as demonstrated by the report of a thin-film display based on bis(phthalocyaninato)praseodymium(III).75 The electrochromic electrode in the display was fabricated by deposition of multilayers (10-20 layers, r+00-200 A) of the complex onto ITO-coated glass (7 x4cm2) slides. The display exhibited blue-green-yellow-red polyelectrochromicity over a potential range of —2 to +2V. After 105 cycles no significant... 

The vitriols, blue, green, and white, were especially important because it was from them that vitriolic acid was prepared. The natural vitriols, copper, iron, and zinc sulfates respectively, were so named presumably because of the glassy surfaces of their crystals (from the Latin vitreus like glass ). 

SPECTRO INSTRUMENTS. Spectro is used as a prefix for a wide assortment of analytical instruments. Spectro is derived from spectrum, which originally referred to the component colors that make up visible light, the so-called rainbow colors of violet, indigo, blue, green, yellow, orange, and red. A very simple device made up of a glass prism to break up sunlight into color bands is referred to as a spectroscope. Much more sophisticated instruments are available for manual manipulation and observation, which still rely on this basic, simple principle these are termed visual spectroscopes, and the field is called visual spectroscopy. 

FIGURE 15.27 The colors of the fluorescent lighting art by Tom Anthony are due to emission from noble gas atoms. Neon is responsible for the red light when it is mixed with a little argon, the color becomes blue-green. The yellow color is achieved with appropriately colored glass. 

---