We can see that all the column is darker, this is because have increased the number of anaerobic microorganisms, since they have carried out a respiration with sulphate, releasing H2S, which precipitates with iron, producing a black FeS compound.
Also, previously we had a gas bubble in the middle of the column, and now we haven´t it, this may be due to the weight of the land has elevated it to the top of the column. •
In this case, the column has more than one colour, the column has more than one colour, we can see that there are areas that predominate the black colour by the same phenomenon that we explained before, due to the precipitation of FeS produced by the anaerobic respiration of some microorganisms.
There are small areas of the column that have an orange colour, produced by photoheteroorganotrophic microorganisms such as Rhodospirillum.
Finally, comment that there is a small gas bubble, this can be methane, carbon dioxide or even sulfuric acid.
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