Greek vases are not so easy to imitate as terracotta figures, the main difficulty being the black varnish, which can never be successfully reproduced. Acids or alcohol will always remove modern counterfeits, but cannot touch the original substance. Since the discovery in Greece of white-ground vases forgers have had a better chance, and they have often ingeniously availed themselves of genuine ancient vases on which to place modern paintings. But the antique drawing is exceedingly difficult to imitate. In former times Pietro Fondi established manufactories at Venice and Corfu, and the Vasari family at Venice, for fictitious vases,[66] and many such imitations have been made at Naples for the purpose of modern decoration. The first to make such an attempt in England was the famous potter Wedgwood, whose copy of the Portland Vase is well known. His paste is, however, too heavy, and his drawings far inferior to the antique in freedom and spirit. At Naples, chiefly through the researches and under the direction of Gargiulo, vases were produced, which in their paste and glaze resembled the antique, although the drawings were vastly inferior, and the imitation could be at once detected by a practised eye. They were, indeed, far inferior in all essential respects to the ancient vases. Even soon after the acquisition of the Hamilton collection by the public, the taste created for these novelties caused various imitations to be produced. Some of the simplest kind were made of wood, covered with painted paper, the subjects being traced from the vases themselves, and this was the most obvious mode of making them. Battam also made very excellent facsimiles of these vases, but they were produced in a manner very different from that of the ancient potters, the black colour for the grounds or figures not being laid on with a glaze, but merely with a cold pigment which had not been fired, and their lustre was produced by a polish. In technical details they did not equal the imitations made at Naples, some of the best of which deceived both archaeologists and collectors. Sometimes illustrations of vases which never had any real existence have appeared in publications. One of the most remarkable of these fabricated engravings was issued by Bröndsted and Stackelberg in a fit of archaeological jealousy. A modern archaeologist is seen running after a draped woman called [PHÊMÊ], or “Fame,” who flies from him exclaiming, [ΕΚΑΣ ΠΑΙ ΚΑΛΕ], “A long way off, my fine fellow!” This vase, which never existed except upon paper, deceived the credulous Inghirami, who too late endeavoured to cancel it from his work. Other vases, evidently false, have also been published.[67]