Microcapsules of the dye precursors. It is called "precursors" because it must be colorless, non-carbon paper, and colored dyes must become under certain conditions. NCR common alternative writing color black, blue, orange, green, red, purple, Beijing carbonless paper, accordingly, Chongqing carbonless paper, the required dye precursors is not the same. PH (PH value) indicators. Usually pH 6.7 or less acidic paper, carbonless paper, Shanxi, 7.2 ± 0.5 for the neutral paper. Acid paper is generally used for writing and general printing. High acidity adversely affects the machine, so the general requirements for neutral paper copy. Grass is typically acidic paper pulp and paper, bamboo, wood pulp paper is generally neutral paper. Carbonless paper, Jinzhou Paper, Hunan carbonless paper provided by the Xinxiang City Jinzhou New Materials Co., Ltd .. Carbonless paper, Jinzhou Paper, Hunan carbonless paper 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.