Shenzhen Kingsway Industrial Co., Ltd. and Germany to share Qingyuan toxic chemical composition of chalk chalk, chalk is made from calcium sulfate dihydrate (commonly known as gypsum). Can be added to a variety of pigments made of colored chalk. In the production process of the gypsum is heated to a certain temperature, non-toxic chalk, it becomes mature partially dehydrated gypsum Guangzhou toxic chalk, plaster and then mixed into a paste with water, poured into the model solidified. Gypsum plaster becomes mature reaction (heating required): CaSO4 · 2H2O = CaSO4 · H2O + H2O. Gypsum plaster with water becomes a reaction to the (room temperature can be): CaSO4 · H2O + H2O = CaSO4 · 2H2O. And Germany Kingsway Industrial Co., Ltd. is specialized in Ai Nina chalk, chalk graffiti home, pastel and other products production and processing, if necessary, please call contact information on the picture and Dorsey Contact Shenzhen Fu Industrial Co., Ltd. for share wood beside chalk written word radical Fame, next to the seedlings, next word is shown next to the m word: four radical will be "left, points" two-handed strokes written in connection pick, shows off the regular script written word has changed the stroke. Next to the handle, the car next to the word, the word next to the cow: These three are the last two radical and challenges associated vertical strokes to write. Ai Nina chalk, chalk graffiti home, chalk dust and Germany preferred Kingsway Industries Limited. Huizhou toxic chalk and Germany _ Kingsway (certified) _ Guangzhou, Shenzhen and non-toxic chalk is provided by the German Kingsway Industries Limited. Shenzhen and Germany Kingsway Industrial Co. (hedehuifu.com) Guangdong Shenzhen, chalk leader, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. And the German leadership at Kingsway staff warmly welcome all inquiries to discuss, create and Germany Kingsway a better future.