Science Forums 2

[cwes99_03]

That has been precisely my point. You can't by the methods you suggested.

The methods you suggest still leave the answer up to interpretation. The echalk link uses a computer model in which the programmer could easily have configured the flash program to gradually fade the center piece into a different color.
To use a piece of paper with a hole in it on your picture above (which is the initial frame of the echalk link) still allows for your interpretation of what your brain tells you is two identical colors. When I tried that demostration on your picture I could see two different colors in the two holes I punched in the piece of paper. Thus I suggested the only actual mechanical method of proof, a photo editing program.

Craig suggested taking screen shots.
I would gladly do that, but right now they are experiencing technical difficulties. Perhaps you could do it when the site comes online.

What I then want you to do is to take a screen shot of the beginning frame and one of the ending frame of the flash object on their website. Then edit the two screenshots and place the beginning frame side by side with the ending frame and post it here on your thread.