With the discovery of gold and the increasing value of rubber on the international market during the 19th century, outsider population increased in Amapá and the territorial dispute with France was brought to a head.
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Modern day conventional hot water bottles were invented in 1903 and are manufactured in natural rubber or PVC, to a design patented by the Croatian inventor Eduard Penkala.
Slingshots depend on strong elastic materials, typically vulcanized natural rubber or the equivalent, and thus date back no further than the invention of vulcanized rubber by Charles Goodyear in 1839 (patented in 1844).
Products made from guayule natural rubber emulsions also do not contain the proteins from the Hevea rubber tree, and do not cause allergy in persons sensitized to Hevea proteins.
Elephant Parade 2010 in London included the "Mason" elephant which celebrated the concept of re-use using natural rubber off-cuts from Mason Pearson.
Currently, Yulex is the only commercial producer of guayule natural rubber in the world.