First we see the column retained in the dark, and you can see that there have been no major changes from the last time we saw it. It is true that certain microorganisms have grown on the surface of the whitish column, and the presence of bacteria (orange color) is still observed. In general, the column takes on a gray/black color, and the water level has not changed.
Now let's comment, the column kept in the light, which has undergone various changes.
On the one hand, we note that the gap formed by the air accumulated between two parts of the column, has disappeared. In the middle of the column, you can see a brown area that was not there before. This brown area has been formed thanks to the union of both parts, separated by the "air bubble".
The water present on the surface, has acquired enough turbidity, and in addition, there are elements floating in it.
In the background, we see small areas of pink color, which is due to the presence of photosynthetic bacteria. The more red the color, the more intense the bacteria will be.
We can also observe a cloudy area of green color, which may be due to the presence of sulfur bacteria.
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