Why Does Ink Move Rapidly on a Film When Refilling a Fountain Pen?

In summary, the conversation discusses the use of a fountain pen for calculations and the observation of a thin film of ink forming around the mouth of the ink bottle when refilling the pen. The film appeared to have rapid, random movements similar to the colors created when oil mixes with water. The cause of these movements is speculated to be due to thin film interference and the constant state of flux of H bonds in water. It is suggested to investigate further to confirm this theory.
  • #1
mahela007
106
0
In spite of the widespread ball point pen, I still use a fountain pen for calculations.. One day, I ran out of ink while writing (duh..) and opened the cap of my ink bottle to refill my pen. Now, as I opened the cap, a thin film of ink was formed around the mouth of the bottle.. in other words, it was like a partially formed bubble.. Now, because this was ink, I was able to see, rapid, random looking movements on this film/membrane of ink...Imagine the colors you get when oil mixes / floats on water.. now imagine those colors were all blue and imagine them constantly moving, turning, twisting etc..
what do you think caused these weird movements? I've read that the H bonds of water are in a constant state of flux and that the bonds keep forming and breaking... could this be the cause?
 
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  • #2
An interesting observation and I suspect it was thin film interfernce,similar to the oil on water pattern you described.The movement could be due to the water draining and evaporating.
 
  • #3
thanks... I'll check that out.
 

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