The conservation profession has its roots in the intellectual movements of the first half of the 19th century, following the Enlightenment. Scholarly study of objects made available by important archeological excavations and discoveries gave birth to the first debates on theoretical issues of preservation. Also the political events which disrupted Europe in the first decades of the 19th century played a significant role in conservation practice. In particular, Napoleon's appropriation of works of art. As much as early conservation treatments can create many problems for conservators today, in some cases, they did prolong the life of an object that might not exist today. In some of these treatments we can see the interest in scientific methods that comprise the foundation of current conservation treatments. Nineteenth century technical inventions brought about by the industrial revolution led to the mass production of many materials. These have had both a positive and negative influence on conservation.