# Why is the left bracket [ darker than the right bracket ] in equations? [closed]

I was writing up some formulas with concentrations on Chemistry.SE, and the left brace is noticeably darker than the right brace. I replaced them with \lvert and \rvert, but it is harder to write. is there a reason for this?

Example:

$$K_{eq} = \frac{[\ce{NO}][\ce{O2}]}{[\ce{NO2}]^2}$$


Here's a link to the question on Chemistry.SE, where you can see the bracing difference, and my answer below where I substituted \lvert and \rvert.

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## closed as off topic by Werner, Gonzalo Medina, Stephan Lehmke, Aditya, egregSep 12 '12 at 6:34

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I don't see any difference in the braces. Perhaps it is just a browser/viewer effect? –  Gonzalo Medina Sep 11 '12 at 23:53
I can get them to look equivalent if I zoom into the page some. Try using ctrl+'+' and ctrl+'-' to view them at varying zoom levels. Perhaps this is a browser issue. –  Ehryk Sep 11 '12 at 23:54
Also, can I not access math mode on tex.SE? Are different libraries enabled based on the site? –  Ehryk Sep 11 '12 at 23:55
This is a rendering issue in MathJax for that specific font style - note the difference when typesetting ${\scriptscriptstyle [x]}\ {\scriptstyle [x]}\ [x]$. TeX.SE does not support MathJax, since it's about the code as well, not just the display/output. As such, being MathJax related, I think this is off-topic. –  Werner Sep 11 '12 at 23:55
Where are MathJax related questions on-topic? Math.SE? –  Ehryk Sep 11 '12 at 23:57