In the 70 years I had one friend, he lived in Moscow and a little fartseval. But matter not in this. By the arrival of Chagall, who was signed in the Tretyakov Gallery hranivshieya there work doemigratsionnogo period, this friend has found people who have been drawing Chagall, absolutely certain, but alas, not signed. They entrusted him with this picture for sale, and my practical friend decided that if Chagall sign it, then the price figure surely increase many times.
Two or three days, he slept at the entrance of the Metropole Hotel and, finally, saw Chagall, leaving the hotel with his wife. He rushed up to him, my dear Mark Z., etc., explained to him the whole story and, at the request of Chagall, showed him the picture.
Chagall takes a picture in hand, considers it, then said: "Ugh, how disgusting!" and breaks it in half.
History is silent on how much time my friend were forced to trade currency to pay his bereaved owners Edit this Chagall
Already then it became known that Chagall has systematically refused to authorship, when he brought his old work, because it was irritated that they are more expensive than the work of the past periods.
Similarly behaved Chirico - ie can not guarantee that he tore up the work, I do not, but denied the authenticity of his older works very often.