Word: pigment
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...lead. This method is the one responsible for such masterpieces of glazing as the windows of the Cathedrals of Chartres and Bourges. The second, or Renaissance method, dates from the 14th and 15th Centuries, when, instead of outlining their designs with lead, artists began to paint them boldly with pigment...
Standing before it, and looking through it at the light, Artist Nicolas is then ready to do his painting. Covering the glass first with an opaque coat of copper-oxide pigment, he draws in the highlights and flowing lines of his figures by brushing away the pigment and letting the light shine through again. When he is through, the puzzle picture is carefully scrambled again, sent to bake in a kiln until each stroke of pigment left on the glass is melted permanently into the pane. The panes are then reassembled, fixed permanently in place with strips of lead...
Serigraph, or Silk-Screen Print (TIME, Nov. 11, 1940), printed through a stencil which has been built up with glue or lacquer on a semitransparent silk screen. Pigment, oozing through the silk, creates a meshlike, colorful surface...
...microscopic protozoa in Iowa ponds for five summers, found they were reddest when the temperature was a sunny 90° or more. Taken to a dark laboratory, the animals turned green, then turned red again not only on exposure to light but to heat. Reason: migration of a red pigment between the animal's interior and its surfaces. Its purpose: to protect the chlorophyll granules from an overload of light, which would destroy the pigment. Besides making food like plants, Euglenae also can eat like animals...
...many sorts of luminescent materials are classified by the stimulus which makes them glow. Some materials are affected by sound, radio waves, slow oxidation, cathode rays, or shaking. But all commercial luminescent pigments are photoluminescent: they glow only after stimulation by light. If the pigment glows for several minutes or hours after exposure to light, it is phosphorescent. If the afterglow is very brief-perhaps only 1/10,000th of a second - the pigment is fluorescent. Hence fluorescent substances glow only when continuously exposed to invisible ultraviolet rays ("black light"), which they reflect as visible light...