First, understand the painter's learning and growth background and the style characteristics of works in different periods;

Second, read more works published by authoritative organizations in the early days or exhibitions held by authoritative organizations for them;

Third, observe the oxidation degree of the mounting, canvas and oil painting pigments of the works, and the time sequence of signature;

Fourth: understand the source of the work and the background of the seller.

Modern people fake famous paintings mainly in the following categories:

First: brand-new imitation;

Second: quickly do the old after the new imitation, spray the old smoke oil on the canvas frame slightly, and then shake off the old house soil;

Third, after the new imitation, slowly do the old, expose the oil painting to the sun, and water the old reed every three days;

Fourth, high imitation is a new painting made by a master after the oil color of the old oil painting in the original frame is removed;

Fifth: add money after the old oil painting.

One of the fifth items that collectors should pay attention to, some old oil paintings are supplemented by the original author, which is not included here. I hope my answer is helpful to you! ~~~