-C4
Under strictly anaerobic conditions after a few weeks, and using the load of cellulose provided by the remains of paper incorporated in the sediment as the primary source for its metabolism, appear the bacteria of the genus Clostridium,and that's why an orange color is appreciated.
C3
-Sulfur-reducing bacteria are displayed as a deep black layer and are represented by Desulfovibrio, using sulfate to produce SH2, which will react with any iron present in the sediment, producing ferrous sulfide, which gives color Black.
The orange colour is due to another microorganism. As for sulfate reducers, the black colour is not a pigment. Is a substance you mention in your post. What is it?
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