I've been trying to write the reduced plank constant \hbar in bold font, but if I use the \bm command, it looks much thicker than normal bold math font. I've zoomed the resulting pdf in and I see the symbol as if two identical symbols were overlapped, as in the following screenshot:

Zoomed in, bold \hbar symbol

What can I do to produce this symbol in bold, so that the result looks like normal bold font?

Edit: here is my code. I'm not including the packages because I'm using too many in the preamble and I'm not much of a Latex expert so I'm not sure which ones are necessary and which ones are not.

\begin{tcolorbox}[enhanced,attach boxed title to top center={yshift=-3mm,yshifttext=-1mm},colback=blue!5!white,colframe=blue!75!black,colbacktitle=red!80!black,title=Enunciado del problema 16,fonttitle=\bfseries,boxed title style={size=small,colframe=red!50!black} ] 
\vspace*{3mm}\textcolor{azure(colorwheel)}{\textbf{I'm writing a text with $\hbar$ and $\bm{hbar}$.
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    Some code? Or should we guess?
    – egreg
    Mar 3, 2020 at 18:25
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    \bm only uses overprinting as a last resort, so if you are using a math font that has a bold version it shouldn't happen. Mar 3, 2020 at 18:39
  • Sorry, I'll include it in a minute, but I just used \bm{\hbar}, that's why I thought it wasn't needed. Thanks! Mar 3, 2020 at 18:40
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    @WildFeather no as you commented later I couldn't tell from the code posted as you had not posted any code that reproduced the problem. It's all about font setup and you have not posted any code relevant to that, that's why we always ask for complete test documents. Mar 3, 2020 at 19:11
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    can you either post an answer or delete so it's not left unanswered, thanks Mar 3, 2020 at 19:14

1 Answer 1


The issue seems to have been caused by the amsfonts package, that was forcing the \bm command to resort to overprinting the \hbar symbol to produce it in bold. Removing the amsfonts package from the preamble, regardless of the other packages included, solves the issue and produces a nice-looking, normal-thickness bold \hbar symbol when \bm{\hbar} is used.

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