'In the field of observation, chance only favors the prepared mind' Pasteur 1854
UCA_8A_4: Day 72 – Finally, some changes appeared!
Rio San Pedro sediment + 0.5g FeSO4 + filter paper
As you can see in the picture our column is still the same. The black stains of FeS still at the bottom and there are a big amount of them.
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| Column day 66 |
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| Column day 35 |
However, this time some little orange stains appeared at the surface because of the FeO2 synthezised by the bacteria. That means the Fe2+ reacted with oxygen and formed those orange stains. There's still more water than the last time.
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| Day 66 |
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| Day 35 |
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