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Today's topic is kinda fun, it gave me a chance to play around with my polarized filters. Pretty much everyone has heard that you can use polarized filters to look at compatibility stress:
But, did you know you can also use it to test for unmarked tempered glass? Here's a piece of plain float glass:
and a piece of tempered glass (and a nice reflection of my light fixture):
There's a nice aurora effect across the glass through the filter, and the edges glow nicely. But, my most favorite and, I think, coolest use for polarized film is to identify tempered glass vintage plates, here's a not tempered plate:
Although the sloped parts of the pattern pick up light, there isn't an overall aurora effect. Now, check this out:
How cool is that? The pattern shows up slightly, and the stress patterns are super obvious.
