1, production date: If the purchased linseed oil is not marked with the production date or the production date is ambiguous, it may be a fake and inferior product.
2. Price: The price of high-quality linseed oil is relatively high. If the price is too low, the linseed oil may be a fake and shoddy product.
3. Origin: Linseed oil is mainly produced in northwest China, such as Gansu, Ningxia and Qinghai provinces. If the origin of the purchased linseed oil does not match these areas, it may be a fake and shoddy product.