You can have real bold calligraphic fonts thanks to Michael Sharpe
's packages: dutchcal
makes available Elsevier's calligraphic font, boondox
makes available the eponymous font in two forms. Finally bickham
makes available Adobe's Bickham Script Pro; this one requires some small work from the user: the font is Opentype and has to be converted to type 1 first, with the LCDF Type Tools
and more specifically by cfftot1
. As the font, though freely downloadable, remains Adobe's property, so that the conversion has to be done by the user. Let me add that it also has a semi-bold version, and that you can call it either as mathcal/\mathbcal
or as \mathscr/\mathbscr
if you want to keep using the default \mathcal.
Here is an example of a code that shows how to use them (I comment all \usepackage but one):
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{dutchcal}
%\usepackage{boondox-cal}
%\usepackage{boondox-calo}
%\usepackage{bickham}
\begin{document}%
\[ \mathcal{D}\quad\mathbcal{D} \]%
\end{document}
Dutchcal:

Boondox:

Boondoxo:

Bickham:
