OXFORD.- The Ashmolean Museum is mounting a campaign to save Edouard Manets Portrait of Mademoiselle Claus, 1868, for the nation. On the advice of the Reviewing Committee, the Culture Minister Ed Vaizey has extended the temporary export bar on the painting until August to give the Ashmolean time in which to raise the funds in order to acquire the painting. The painting has been sold to a foreign buyer for £28.35 million but, under a private treaty sale, with tax remission it can be purchased by an approved UK public collection at a greatly reduced price. The Ashmolean is approaching public funding bodies, trusts and private individuals, and launching a public campaign to raise the required £7.83xmillion. Dr Christopher Brown CBE, Director of the Ashmolean, said, This is one of the most important pictures of the 19th century which has been in this country since its sale following the artists death. The