The factory of Nuevo Baztán continued working for some years, and turned out excellent glass for exportation to America and other parts; but it was killed eventually by the rising price of fuel, and above all by competition from abroad. "When the foreigners," says Larruga in his _Memorias políticas y económicas_, "saw that the factory was in full swing, they conspired to bring about its ruin, and begged their ambassadors to communicate against it with the ministers; but finding this of no avail, and recognising the importance to themselves of overthrowing this manufacture, they decided to sell glassware at a price at which it would be impossible to sell the products of Nuevo Baztán. The amount of this reduction was the one-third part of the entire value. By this means the foreigners made it impossible for the factory to support itself, since the objects it produced were laid away and found no purchaser for years. This, and the cost of the wood required to keep the ovens burning day and night, not excepting feast-days (for to stop the fires for a moment would have meant the spoiling of the oven), induced the downfall of this celebrated factory, as soon as the fuel of all the neighbouring forests had been consumed." Nevertheless, upon the closing of these works, one of the experts who had been employed there, a Catalan named Ventura Sit, attracted by the forests of Valsain and the excellent and abundant sand obtainable in this locality--principally from near the villages of Espirdo and Bernuy de Porreros--decided to open another glass-works at La Granja. Here is the royal summer residence of San Ildefonso, and Sit was fortunate enough to secure at the outset--that is, in 1728--the firm protection of Philip the Fifth and of his consort, Isabel Farnese. Instructed by the sovereigns to make some mirrors, he produced these objects of a moderate size at first, increasing it, after the year 1734, to a maximum length of 145 inches by 85 in breadth. Larruga says that these mirrors were the largest produced anywhere at that time, and they continued to be made until very nearly the end of the century. They are often referred to in the narratives of travellers. Swinburne wrote in 1776: "Not far from Carthagena is a place called Almazaron, where they gather a fine red earth called Almagra, used in the manufactures of Saint Ildephonso, for polishing looking-glasses. In Seville, it is worked up with the tobacco, to give it a colour, fix its volatility, and communicate to it that softness which constitutes the principal merit of Spanish snuff." Describing the royal palace at Madrid, the same author says that the walls of the great audience-chamber "are incrustated with beautiful marble, and all round hung with large plates of looking-glass in rich frames. The manufactory of glass is at Saint Ildefonso, where they cast them of a very great size; but I am told they are apt to turn out much rougher and more full of flaws than those of France."