(1) Observation with eyes: pseudosilicone oil will be turbid, with strong odor and bad smell;
(2) Use fire to test: use a glass rod or iron rod dipped in a small amount of silicone oil to ignite. The one that can ignite and emit black smoke is white mineral oil. Pure silicone oil will not burn when ignited with fire, and it is odorless, transparent and non-toxic. The ignition point of silicone oil is 320 ℃;
(3) Freezing point test: silicone oil in - 50 degrees will not appear frozen, false silicone oil will appear turbid or frozen.