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mysterious water bottle grime(14 posts)

mysterious water bottle grimefiltersweep
Aug 25, 2001 1:56 PM
This is one of life's great mysteries (to me, at least): I purchased two new water bottles after reinventing penicillin, AND I purchased a second cage (so I KNOW the cage is clean)... anyway, where does all that grime on the outside of the bottles come from? How does clean alloy on clean plastic these marks?

This doesn't bother me, so this isn't a rant- merely a physics question.... or chemistry question. It doesn't matter the color of the bottle or the color of the ink, it all ends up black, and it appears to be caused by cage contact. I'm just curious and willing to entertain any and all theories.
Trollman suggests....Trollman
Aug 25, 2001 2:22 PM
Strapping yourself to the front end of a lorry and henging there while it moves. At the end of the day Trollman would be surprised if you didnt have an answer to your question.

Hint: What color is asphalt?
Lorry, eh?9WorCP
Aug 25, 2001 2:26 PM
Lorry?! TRUCK! Trollman is from another land.
I don't think sofiltersweep
Aug 25, 2001 2:40 PM
...then it would be all over the bike, not just on the bottles, and more specifically where they contact the cages- I'm just trying to be logical here....
I don't think soSkip
Aug 25, 2001 2:56 PM
99:1 its road grime (better odds than powerball). The bottles are different temp from ambient (esp. if the solutions are cold), therefore you get condensation which attracts dirt, etc. The interface between bottle & cage is not very aero, and also adds to the accumulation at these points.
Trollman is pleased...Trollman
Aug 25, 2001 3:21 PM
That others have picked up on the obvious temperature (celsius or farenheit) issues here.
...still not sure....filtersweep
Aug 25, 2001 3:51 PM
temperature diff... nic try... of course I'm traveling much too fast for any condensation to occur- ALSO- we all know it doesn't take long before that bottle is air temperature....
...still not sure....Lone Gunman
Aug 25, 2001 5:39 PM
The road grime sticks to the bottle and is ground into the plastic by the rails of the cage. In fact the cage on my down tube has worn the paint off of it from the grime, while the seat tube cage is clean.
...still not sure....Skip
Aug 25, 2001 8:54 PM
Damn, thought you might be the gullible type and believe that story - sure sounded good, and scientific too.

OK, here's the real reason: ALIENS - yup, they delegate the task of dissemenating (not misspelled; as opposed to the word dissem-I-nating)) cosmic asteroid dust, to their teenage spaceship newbies. They dart in at lightening speed, cloaked, so you can't detect them, and electrostatically discharge the positively charged asteroid dust from their GASS (galactic asteroid super soaker) guns, aimed specifically at your water bottles. Since the water bottles pick up a negatively charged surface, because of the forwardly revolving pedal strokes, specifically from your bicycling shorts (very similar to sliding your socked feet across a wool rug, in the dry atmosphere of the winter, then reach for that metal (iron works best) object - ZAP!). So is the asteroid dust attracted to your water bottles. You can help to negate this effect, and diminish the accumulated asteroid dust, by back pedalling 1 stroke for every 1 forward stroke. 1 forward, 1 back; 2 forward, 2 back; and so on. Best of luck, and please don't do anything to torment those teenage aliens, you won't like them when they get upset.
I don't think soDINOSAUR
Aug 25, 2001 5:06 PM
Yep, I think it's just plain old road grime. I just start the season off with new water bottles, unless someone has away to safely remove the grime.
Yup, same grime on front of legs (nm)KStone
Aug 25, 2001 3:10 PM
it's high in mineral content and good for you to eat too!!(nm)harlett
Aug 25, 2001 3:29 PM
re: mysterious water bottle grimeamflyer
Aug 26, 2001 7:11 AM
I think I will disagree with the road grime stainless steel cages don't leave the black marks on my bottles like the alloy cages do. Ever see all the nasty black goo you get when you polish aluminum? I'm bettin' my money it's a similar process.

WE HAVE A WINNER!!!!Kerry Irons
Aug 26, 2001 4:10 PM
The black stuff is finely divided aluminum metal/metal oxide. Same kind of stuff that makes chains black. You'll note that you only start to see this AFTER the paint/finish has worn off the cage. You only get this with Al cages, which is why I swore them off many years ago. Who needs a bottle that looks like it spent the night in a coal mine.