Undergrad Ice patterns on the inside of my windshield

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Intricate ice patterns observed on the inside of a windshield have sparked curiosity regarding their formation. The patterns resemble frost and include geometric shapes like equilateral triangles, rhombuses, and hexagons, likely influenced by the sixfold symmetry of ice crystals. The temperatures were around -2°F with 60% humidity when the patterns appeared, and the discussion emphasizes that these formations occurred internally, not due to external factors like wiper fluid. Suggestions include cleaning the windshield to see if it affects future formations and considering the role of glass polishing or potential residue from engine coolant. The phenomenon remains unexplained, with interest in further observation and time-lapse photography.
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I got into my car last night saw these patterns on the inside. Some of them just look like frost formed on some streaks from when I must have wiped it, but then there all these really intricate patterns of intersecting straight lines. There were no cracks or scratches on the interior that I could feel.

This picture is the most interesting because the lines make a nearly perfect equilateral triangle near the center of the picture:
y9UkZmp.jpg

Zoomed out, you can see one of the places where it looked like frost formed by sticking to lines of grease or something left over by a wipe:
msZOjol.jpg

There was an interesting rhombus-like pattern also:
fC4aCPU.jpg

And also a hexagon pattern in the bottom center of this one:
mWSwLO9.jpg

Zoomed-out picture showing most of it (the date and time on the clock are both way off so ignore that):
bWzX5ph.jpg

I've never seen this before and I'm wondering what could have caused it? I posted this elsewhere and several replies (who apparently did not read when I said they were on the inside of the windshield) insisted that it was due to wiper fluid.

Given how many near-60-degree angles there are in the pictures, I assume it has something to do with the sixfold symmetry of how ice crystals and snowflakes form, somehow projected on to the inner surface of my windshield.

It was around -2 F out at about 60% humidity when I took these. I am going to see if the same thing happens again tonight since the weather will be about the same.
 

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What gets spoiled if I click on the spoiler? o0) I want to look at what I guess are pictures but I don't want to spoil anything.
 
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Spinnor said:
What gets spoiled if I click on the spoiler? o0) I want to look at what I guess are pictures but I don't want to spoil anything.

The pictures are very large so I nested them in spoiler tags.
 
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Another stupid question, inside or on the outside of your windshield?
 
Spinnor said:
Another stupid question, inside or on the outside of your windshield?

All of the patterns were on the inside. In the first two pictures, the lumpy pieces of ice on the right edge of the windshield are on the outside, but all of the lines and streaks were on the inside surface.
 
You might clean just the drivers side part of the window really good and see what effect that has, plus you will get to see a bit better.
 
I'm going to guess crystal structure (which glass isn't supposed to have) or polishing "scratches".

Do you keep the inside of your windshield religiously clean?
 
Engine coolant can spray on the interior of a windshield due to a malfunctioning defroster.

Likely you would have this stuff accumulate and have to be wiped off. Recall an experience where "weird" stuff had to wiped off the inside of the windshield?
 
jack476 said:
Hurry up and decode it to find out what Optimus Prime is trying to tell you.
350px-Movie2007_Sam_holds_up_glasses.jpg
 

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