Christophe wrote:ABC2019 wrote:it just means that the evaporation has concentrated the dye at the top of the wick ... moreover your drop does not seem justly colored!
No I mean "at the bottom of the top of the curved bit down" (hey have to follow!
).
We can see it quite well in this photo:
20200308_233628.jpg
bah yes then the dye molecules have a lower potential energy at the bottom than at the top, it's normal that its concentration is higher.
The tip of the wick is also wetter than the rest but it is difficult to show in photos ...
same reason (and it's basically the same reason that the pressure drops with altitude!).
If the drop had not been colored I could not have taken a photo: it is a trace of dye ...
to the eye it looks rather wet spot without dye, but hey it may also be that by handling the wick you dropped a droplet;). In any case your close-up photo does not show any drop in formation ready to fall, and as I said the detachment of a drop is not so simple!
Good there is more than to wait for the other (possible) drops ...
with the photo of the drop in formation please!
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