Whiteness, color indicators. Whiteness refers to the degree of the white paper, usually with 0-100 (0-100%) that is all black 0 degree and 100 degree polar white. General Whiteness above 80 degrees, the most suitable for the human eye for a long time to write the paper whiteness of 85-87 degrees. So handmade writing paper as material paper, carbon paper quotes, accounting books, documents, reports and so should be selected within this range. Printing paper, copy paper whiteness generally 88-95 degrees. Chroma is colored paper color shades, light or dark, color is generally used to measure the standard color samples to determine the ratio. Development process mainly depends Jieshengjishi ancestors in ancient times, after gradually invented writing, the price of carbon-free paper, starting with bones as writing material. Later it was found, and the use of bamboo and wood (ie Slips) and fine silk as writing material. However, due to fine silk, too expensive, too bulky wood, so they led to the invention of paper. According to research, when the Western Han had begun production of paper. But we should also see, although very early invention of paper, but a start has not been widely used, non-carbon paper wholesale, government documents still use bamboo slips, fine silk silk manuscripts written. To when Emperor Xian, who left primary again DongLai conventional papermaking process has been improved, Zhoushan carbonless paper, to further improve the quality of the paper. He made the paper white, delicate, soft, dense uniform, bright color, paper is preferred, the Bank said "left Bo paper", especially colored flowers Jianzhi, senior book stationery is on. Zhoushan no carbon paper, Jinzhou paper, carbon paper supplied by wholesale Jinzhou New Materials Co., Ltd. of Xinxiang City. Zhoushan no carbon paper, Jinzhou paper, carbon paper wholesale Xinxiang City, New Materials Co., Ltd. Jinzhou (www.hnjinzhou.com) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: Wang Qiang.