Methanogenic Menses

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There is an obvious visual metaphor here reflected in th title. These are examples though  of “Wet Wood”, a colouless slime that exudes from cracks in a tree’s bark and which blackens  upon contact with air. This phenomenon is caused by a type of microbe called a methanogen, that grows in the absence of air and which produces amongst other things methane. If the internal pressure of the gas is high enough, it can be ignited to produce a jet of flame. Another signature of a sublime and invisible world.

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