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I have now inspected the sample under white light thats emitted from the sun. Now my camera does a better job at capturing the results pretty close to what I can observe trough my eyesight. To my surprise it seems like there now is a second visible precipitate layer that is also rather solid (it does not enter suspension again after shaking the tube a little with a rubber stopper on top). Its slightly brighter than the layer thats found at the bottom and has a very milk-like texture.
