Titanium dioxide, whose scientific name is titanium dioxide (TiO2), is an important inorganic chemical white pigment whose main component is titanium dioxide. Titanium dioxide has a wide range of uses and is widely used in coatings, plastics, paper, rubber, inks, chemical fibers, ceramics, daily chemicals, medicine, food and other industries. The titanium dioxide market is full of fakes and shoddy products.

physical method
—1. Touch by hand: different tactile sensations

  • Water flushing: different degrees of residue
  • Add titanium dioxide to water: look at the settling speed
  • Check the solubility in water

chemical method

—1. Add hydrochloric acid: the sound is different

  • Add hydrochloric acid: the smell is different
  • Add ethanol to moisten and then add hydrochloric acid: observe whether there are bubbles

physical method

  1. Hand touch: Rutile titanium dioxide feels smooth and delicate, anatase titanium dioxide is astringent, mixed with calcium powder, kaolin, and talc powder is smooth, and mixed with precipitated barium sulfate and lithopone is astringent.
  2. Rinse with water: Dip some titanium dioxide on your hands. The adulterated ones are easy to wash away, but the real ones are not easy to be washed away.
  3. Add titanium dioxide to water: look at the sedimentation speed, the one with a higher adulteration ratio will drop faster;
  4. Look at the compatibility with water. General-purpose titanium dioxide is soluble in water [Titanium dioxide for plastics, titanium dioxide for inks and some synthetic titanium dioxide are also not soluble in water]

chemical method

  1. The reaction of adding hydrochloric acid to calcium powder is violent and produces a squeaking sound, and a large number of bubbles are produced at the same time (because calcium carbonate reacts with acid to produce carbon dioxide).
  2. Mixed with lithopone and adding hydrochloric acid, it will smell like rotten eggs.
  3. If it is hydrophobic and does not react when adding hydrochloric acid, if bubbles are generated after adding hydrochloric acid after adding ethanol to moisten it, it proves that it is mixed with coated calcium powder.