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Latex is practically a neutral substance, with a p H of 7.0 to 7.2.However, when it is exposed to the air for 12 to 24 hours, its p H falls and it spontaneously coagulates to form a solid mass of rubber. For example, exposure to air causes it to mix with various materials, which is perceptible and can cause rot, as well as a temperature-dependent stickiness.
Because tappers worked in near complete isolation, they were not burdened by overseers and timetables.
At higher temperatures, the rubber became softer and stickier, while at lower temperatures it became hard and rigid.
The South Amerindians first discovered rubber; sometime dating back to 1600BC.
Rubber was used as an eraser by scientist Joseph Priestley in England.
It was not until the 1800s that practical uses of rubber were developed and the demand for rubber began.