I am trying to produce a blackboard bold semicolon.  My test file is as
follows:

<testfile>
\documentclass[12pt]{article}
\usepackage{amsfonts}

\begin{document}
$R{\mathbb{;}}S$ and $R;S$ should look different (the semicolon should
be blackboard bold and normal, respectively).  Also, look at
$\mathbb{R;S}$ and $R;S$ the complete math expressions should be
blackboard bold and normal, respectively).
\end{document}
</testfile>

Following the advice in the "Comprehensive LaTeX Symbol List", I have
tried this using the amsfonts, amssymb, txfonts, pxfonts, mathbbol, bbm,
and dsfont packages (with the variant versions of the \mathbb command).
I didn't try the bbol or mbboard packages, since they are not installed.  

None of these produced a blackboard bold semicolon---just the normal
semicolon.

Note that the blackboard bold semicolon showed up ok in "tex testfont",
using bbold10 (or bbold17) as the test font.

Any idea what I'm doing wrong here?  Thanks.

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