# \alert within align in Beamer

I am trying to use alert within the AMS-math align environment, so that sets of equations uncover sequentially and are highlighted. I would expect something like this to work:

\begin{align}
\end{align}

by highlighting the first two equations in the first slide and the next two in the next slide. I am doing something wrong? Or is there a different way to get this to work?

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–  Joseph Wright Nov 28 '11 at 12:12

It's explained in the Beamer manual, section 23.4:

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{align}