Thanks for that explanation Adam.

But ... But ... Wouldn't that sort of special effect require everything else on the stage - furniture, actor's costumes, actor's makeup, etc - to be specially colored to avoid the effect that happened only with this particular actress' dress?

The stage appeared to my untrained eyes to be lit with a uniform, generally electric lightbulb colored white. The lighting designer had it easy for this play. Lights up, lights down, intermission, lights up, lights down, play over, lights up, players take a bow, done.

I have probably not given you enough information in any of my posts in this thread and for that I appologize.