Normal tissue paper color should be ivory white, natural white. If you buy back the tissue is snow-white, it is the result of adding too much fluorescent agent. The use of substandard tissues, the lighter the itchy skin, serious cases can lead to skin disease. To identify whether the tissue contains fluorescent agents, you can use a money detector to irradiate the tissue, if the tissue is blue-purple light, usually added excessive fluorescent agents, please stop using immediately.