Physical methods:
The simple method is to compare the texture, with fake titanium dioxide being smoother and real titanium dioxide being more astringent.
Water flushing, getting some titanium dioxide on your hands, fake ones are easy to flush off, but really not easy to flush off.
Take a glass of clean water and throw titanium dioxide into it. If it floats up, it is true, and if it settles down, it is false (if it is an activated modified product, it will not work).
Chemical methods:
Mixing light calcium or heavy calcium: Adding dilute sulfuric acid or hydrochloric acid can cause clear lime water to become turbid due to the reaction of calcium carbonate with acid to produce carbon dioxide.
Mixed with Lide powder: Add dilute sulfuric acid or hydrochloric acid, it has a foul egg odor.
Made into latex paint, with iron red added, the color is dark, indicating poor covering power as fake or poor quality titanium dioxide.
There are also two better methods:
Using the same PP+30% GF+5% PP-G-MAH+0.5% titanium dioxide, the lower the strength, the more genuine the titanium dioxide (rutile).
Choose a transparent resin, such as transparent ABS+0.5% titanium dioxide, and measure the transmittance. The lower the transmittance, the more genuine the titanium dioxide.