Why was michel chevreul's discovery of the law of simultaneous contrast beneficial to impressionist artists? a he defined hot and cold colors. b he asserted that mixing colors optically created the most intense colors. c his discovery allowed the artists to better understand complementary colors. d he divided types of colors into purity, luminosity, and hue.

The correct answer is C) this discovery allowed the artists to better understand complementary colors.

Michel Chevreul's discovery of the law of simultaneous contrast was beneficial to impressionist artists in that this discovery allowed the artists to better understand complementary colors.

Michel Chevreul's law of simultaneous contrast shows the way one color affects others. that complementary colors can give optical effects that influence their complements by enhancing them or mute them. This means that an individual perceives how one color changes the tone and hue of another when they are next to the other. The colors never change. What happens is that we perceive a change.  

rain should be the answer.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals