The juice of the “weeping” Hevea tree was valued at its weight in gold by the end of the 19th century. The process of producing its juice became elastic and resilient rubber, vital for transport and industry. The rapid production development of machine production literally squeezed every possibility drop of milky Caoutchouc juice from Hevea. Chemists had to save the situation. In 1770 Joseph Priestley an English Chemist used this milky juice called Latex and invented a rubber eraser, to erase pencil drawings. From this material rubber utensils, household items, waterproof shoes, clothes and hats were also made..