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When wood turns black, what does this mean ?

When wood turns black, what does this mean ?

Could be a number of reasons such as -
1) Attack by wood rotting fungi. Some fungi are termed brown rots including dry rot and cellar fungus and these have a tendency to darken affected timber.
2) Prolonged exposure to moisture will cause timber to darken
3) Black spot mould on the surface as a result of excessive condensation will have the same effect
3) Oak that is damp is particularly prone to turning black.

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