It is not necessary to follow in close detail all the modifications and vicissitudes (extending over quite a hundred years) which affected the Alcora factory. I therefore only take some general notices from Riaño. In 1750 Count Aranda transferred the works to a private company, which remained in possession of them until 1766. In 1741 a Frenchman named François Haly was engaged for ten years, and with a yearly salary of rather more than a thousand francs, under the following conditions:-- "That the travelling expenses of his wife and children should be given him, and that his salary should be paid as soon as he made before the Director and two competent judges the different kinds of porcelain which he had undertaken to make." Haly agreed to surrender his recipes, and it was promised him that he should have two modellers and one painter working by his side, and that if in one year his porcelain were satisfactory, the Count would make him a present of a thousand _tornoises_.[100] [100] Riaño; _Handbook_; pp. 182, 183. Porcelain was first produced at Alcora towards the middle of the eighteenth century. A contract was drawn up on March 24th, 1764, with a German called John Christian Knipfer, who had already worked there in the pottery section. By the original agreement, which exists in the archives, we find he was to prepare works of "porcelain and painting similar to those made at Dresden, during a period of six years, under the following conditions:-- "That the said Knipfer obliges himself to make and teach the apprentices the composition and perfection of porcelain paste, its varnishes, and colours, and whatever he may know at the present time, or discover during this period of six years; he is not to prevent the Director of the Works from being present at all the essays made. "The said Knipfer offers to make and varnish porcelain, and to employ gold and silver in its decoration, and in that of the ordinary wares; likewise the colours of crimson, purple, violet, blues of different shades, yellow, greens, browns, reds, and black. "That Knipfer will give up an account of his secrets, and the management and manner of using them, in order that in all times the truth of what he has asserted may be verified." [Illustration: LXXI ORNAMENT IN PORCELAIN OF THE BUEN RETIRO] In 1774 a Frenchman named François Martin was engaged to make "hard paste porcelain, Japanese faïence, English paste (pipeclay), and likewise to mould and bake it: the necessary materials to be provided by the Count of Aranda." Riaño says that the combined assistance of Knipfer and Martin went far to better the products of the factory.