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I am using mhchem to write chemical reaction such as the following : \ce{H2SO4 ->[H2O] 2H^+ + SO4^{2-}}. It works fine, but when it comes to print it on paper the charges of the ions (+ and - symbols) are so thin that + symbol appears as being almost the same as - symbols. The printed results depends a lot on the printer, but on the institutional one, I will have to use (no choice), + and - are really close. I am writing an exam and this issue is quite important to me.

So my question is how can I make the rendering of those symbols thicker so that those symbols can be easily discriminate?

Jasper Habicht
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raoulpetite
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    Welcome to TeX.SX! Maybe this or this can help? But maybe you should just change the font? – Jasper Habicht Feb 09 '23 at 10:27
  • Thank you @Jasper. Not all the methods given in the links you gave work, but the two following from link works just fine : 1: \newcommand{\Plus} and 2: \newcommand*{\myplus} – raoulpetite Feb 09 '23 at 12:02
  • This need a modification of the font's + sign, I'd say. Easiest solution would be to use a bolder (i.e. non-serif) font, if that is an option for you. – mhchem Feb 10 '23 at 07:08

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