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The three Pyrex blanks I’ve seen and two I’ve worded on all had a yellow tinge especially noticeable when looking through the edge. Two were Astro-Optical Supplies glass and one was Coulter Optical. I read that soda glass has a green tinge.
I have a 16” blank (unknown glass type, 29mm thick polished to 5% from edge). It is distinctly blue/green. It’s a project I may finish one day (or not) as the case may be.
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