What is titanium dioxide？ How to distinguish fake and real titanium dioxide?
钛白粉是一种重要的无机化工颜料，主要成分为二氧化钛。钛白粉的生产工艺有硫酸法和氯化法两种工艺路线。在涂料、油墨、造纸、塑料橡胶、化纤、陶瓷等工业中有重要用途。那么应该如何分辨真假钛白粉呢？
Titanium dioxide is an important inorganic chemical pigment, the main component of which is titanium dioxide. The production process of titanium dioxide includes sulfuric acid process and chlorination process. It has important applications in coating, printing ink, paper making, plastic rubber, chemical fiber, ceramics and other industries. So how should we distinguish true and false titanium dioxide?
1.使用物理方法鉴别真假钛白粉：最简单的方法是比较手感，假钛白粉较滑，真钛白粉较涩。水冲，手上沾点钛白粉，假的容易冲掉，真的不容易冲掉。取一杯清水，丢钛白粉进去，浮上来就是真，沉淀下去的为假（如果是活化改性的产品就不灵）。
Use physical methods to identify true and false titanium dioxide: The simplest method is to compare the feeling of touch. The false titanium dioxide is slippery and the true titanium dioxide is astringent. When you wash with water, you get a little titanium dioxide on your hand. It's easy to wash off fake ones, but it's really not easy to wash off real titanium dioxide. Take a glass of clean water and throw titanium dioxide into it. The one that floats up is true and the one that settles down is false (if it is an activated product, it will not work).
2. 使用化学方法鉴别真假方法：掺了轻钙或重钙加入稀硫酸或盐酸，有气泡可以使澄清石灰水变浑浊，因为碳酸钙会与酸反应产生二氧化碳。掺了立德粉加入稀硫酸或盐酸，有臭鸡蛋气味。做成乳胶漆，加铁红，颜色深，说明遮盖力差的为假或质量很差的钛白粉。
Chemical method is used to identify the true and false: add light calcium or heavy calcium into dilute sulfuric acid or hydrochloric acid, and bubbles can make the clarified lime water turbid, because calcium carbonate will react with acid to produce carbon dioxide. Mixed with lithopone and diluted sulfuric acid or hydrochloric acid, it has the smell of rotten eggs. It is made of latex paint, with iron red and dark color, which indicates that the poor covering power is false or poor quality titanium dioxide.
