Word: pigment
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...chlorophyll, the green coloring-matter in leaves, which acts as a catalyst, speeding up the transformation, but undergoing no conversion itself. Since chlorophyll is not effective as a catalyst when extracted from the plant, chemists have been unable to study its action. It is composed of two separate pigments, blue-green chlorophyll A and yellow-green chlorophyll B, whose atoms of carbon, hydrogen, and nitrogen are arranged in rings similar to that of the red pigment in human blood corpuscles. Main difference between the chemical composition of chlorophyll and the coloring matter of blood cells is that the former contains...
Arts in Democracy. Agreeable as it may be that some 4,000,000 U. S. citizens who seldom saw an oil painting in their lives are now not only seeing plenty but learning such things as the reason paintings crack (more oil in bottom layers of pigment than in top layers), the question remains as to how firmly rooted this program is. One answer to that question is political and obvious. Another answer can be made only when time has had a chance to sap the present enthusiasms of the school children of Salem, Oregon, the Junior League of Sioux...
...Eggs used as pigment binder, painted on a dry surface...
...chemical symposium in Manhattan last week Dr. Kurt G. Stern of Yale announced that he had isolated a red pigment molecule from liver tissue which weighs 3,000,000 to 4,000,000 units. This is the biggest molecule ever found to be a normal part of vertebrate animals. It was extracted while Dr. Stern and his co-workers were purifying enzymes in a powerful centrifuge, which separates molecules of mixed weight by whirling them at high speed...
...paradox, however, that Duveneck's paintings seem more native to the "brown decades" in the U.S. than the paintings of some fo his stay-at-home contemporaries. he loved the brown pigment, bitumen, and it not only dulled his canvases but cracked extensively after a few years. His magnificently drawn and sometimes vivid portraits have the air of life in a darkened parlor, not the sunny tavern-and-haystack life which Duveneck and his pupils actually led. Artist Duveneck entered parlor society briefly in 1886 through his marriage to Elizabeth Boott, a refined Bostonian traveler straight out of Henry...