Why can i see a blue dot of light at the origin of the crack in my screen?

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Android Central Question

Something got set on my phone and I can see a blue dot at the point where the crack begins. Can still use the phone, it does feel like whatever it was chipped some of the glass out. Maybe punctured it.
 
It's most like what's called a prismatic effect - that tiny spot on the broken glass is scattering every color except blue, so it looks blue. (That's why the sky looks blue - up there it's called Rayleigh scattering [named after the nineteenth-century British physicist Lord Rayleigh, who discovered what causes it].)
 

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