Río San Pedro sediment + 2g CaSO4 + filter paper
It passed a week since the last observation.
Light exposed column: the changes we can appreciate are an increase of the seaweed population in the very first phase, thanks also for the presence of photosynthetic bacteria developed in the column. In the first part of soil that is exposed to the light we notice a very bright orange color, that's for the development of oxidative bacteria. Way down from the column we realize an increase of dark spots thanks to the precipitation of iron sulfide.
Dark column: in the column leaves in dark conditions we have not noticed important changes, but the increase of dark spots by the end of the column thanks to iron sulfide's precipitation.
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