This is my fourth post about our winogradsky's column. I want to remember that, in the last week,the top of the mix had changued the colour of dark grey to brown.
In this two weeks, this colour has advanced to the rest of the mix and ,now,one half of the mix is brown. We believe that the bacteria have reduced the majority of the sulphates(SO4) to sulphides(H2S). Therefore the thiobacillus, that they can transform the sulphides(H2S) to sulphuric acid(H2SO4), have proliferated (they are the responsible of the brown coloration). Decrease of the H2S has caused that the smell is not as strong as before. We supossed that in the next week the poblation of these bacteria will continue to rise. Too, we bserved the aparition of more bubbles. Possibly, it´s due to the cyaobacteria of the surface.
The differences between the faces of the bottle are minimal.
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