General Rules and there can not be. Every situation is individual artist. For example, to determine the authenticity of Chagall's simple. There are so-called Committee Chagall, who closely monitors all of Chagall, sold at auction. The same Committee issued certificates of authenticity to the work of Chagall. Thus, if sold at an auction of Chagall's works has a certificate of authenticity, issued by the Committee of Chagall, then this work is genuine, and you acquired the work, then be able to easily sell it at any auction or through any gallery, doubt its authenticity none not arise.
With other artists, sometimes in different ways. For some artists are recognized experts, whose expertise is unequivocal proof of the authenticity of work. In addition, there is the notion of provenance (origin) of work. For example, the work could be once purchased from the artist himself or his family, which is documentary evidence, etc.
In general, in each case should be dealt individually. Often it happens very, very difficult. I'm not talking about mistakes ekpertizy and other possible discrepancies. Fake examination may also occur.
However, to insure the acquisition of fakes can. Serious galleries, for example, provide guarantees for the purchase from their work. If in the future there are any doubts about the authenticity of such work (for example, in a subsequent sale), you will be able to return this work to the gallery and get their money back.
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