Why isn't getting the three wisps enough?

Hint 1 of 11:

You're going to have to look at this screen under many different colors
before you can get out of this section of the game.  Try all six possible
color combinations (red, orange, yellow, green, blue, and purple) before you
read on any further.

Hint 2 of 11:

If you need help changing the colors, read the "What's the general idea
here?" question for additional information.

Hint 3 of 11:

The vampire (in red) will tell you that you need to make the white light
bounce three times to help you get out of here.

Hint 4 of 11:

What you need to do is place three reflective surfaces around the room.

Hint 5 of 11:

The things that will hold these surfaces are visible only under certain
colors of light.

Hint 6 of 11:

Start by putting a mirror on the green hand.

Hint 7 of 11:

You can also use the purple ghost.

Hint 8 of 11:

Put the spectacles on it.

Hint 9 of 11:

And then use the vampire to hold the third item.

Hint 10 of 11:

It looks like he's missing a tooth.

Hint 11 of 11:

So use the scythe on him.