Alternatively, you can look at a big piece of white paper that is strongly illuminated by a lamp. Rotate the film back and forth by 90 degrees. As you do this, you should be able to see a mustard colored hourglass which rotates as you rotate the film. If you keep the film stationary then the figure will fade within a few seconds. The yellow hourglass is the easiest portion of the figure to see.
Many people can also see two bluish-purple dots at the side of the hourglass.
My colleague Roger sees an aquamarine color, similar to that shown in the picture above.