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.
${\scriptscriptstyle [x]}\ {\scriptstyle [x]}\ [x]$. 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