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???? - You do mean to put a glass pie plate or plastic or something over
the glass on the overhead don't you? Or do you not have to?
I used to do a similar effect with a glass pie
plate and eye droppers with water and Wesson oil and thefood colors. It is
like a light show lava lamp! But it did not work when kids helped, the
oil was a a bit of a mess all over the projector when done.