 Now we want to demonstrate the Bureh reagent, which is an indicator for proteins. You can see that the Bureh reagent is a nice royal blue color. So we will be looking for a color change from this royal blue color during our demonstration. I have two test tubes, one marked with an A, one marked with a W. In the test tube marked with an A, I'm going to put in one dropper full of an albumin solution. In the test tube marked with a W, I'm going to put in one dropper full of water. Next, I'm going to add the Bureh reagent to each. So I'm going to add three drops to water and you see we do not get a color change. It's a lighter blue, but we still have blue. Now let's add three drops to albumin and you see we go from having a blue color to having a very dark purple color. So the Bureh reagent indicates the presence of proteins by turning from a blue color to a purple color.