Subject: What chemicals are in the Princeton experiment

I submitted this question earlier, and was asked for a more specific 
description. 

I am a science teacher, and as part of my curriculum, I use Optical 
Data videodisc lessons. The lesson on Physical and Chemical change 
shows a dramatic example of chemical change called "The Princeton 
Experiment." In the experiment, three clear liquids are added to a 
flask with an automatic stirring device. As the third liquid is 
added, the solution quickly turns an opaque yellow, and then almost 
immediately turns jet-black. Since this experiment has a name and is 
not explained in the teacher materials, I assume it is rather famous. 
I would like to know what three liquids are used in the experiment.
Thank you very much.

Re: What chemicals are in the Princeton experiment