Testing for tempered glass. Did I do it right?

[Sasq40]

Getting ready to drill my tank and I'm pretty sure I did the test correct and my bottom is not tempered. Here's a video let me know if I did it right. Used a polarized filter on my camera.

bottom test for tempered glass: http://youtu.be/EnOrNIyIG9o
Side test for temperad glass: https://youtu.be/IqHk5qRtmH4

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[arrowan54]

http://www.youtube.com/watch?v=-xiD7C0hLX4

[Sasq40]

Yeah I seen that so seems mine isn't tempered. Just wanted to make sure I did it right

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