Mr. Dulles. I understand.
Mr. Cadigan. Once it is in that machine then that wheel will mark the tape going through the dispenser just before it wets it and you paste it down.
Mr. Dulles. Just before, generally just before it is used, then these markings are put on by the dispensing machine.
Mr. Cadigan. Yes, sir.
After examining the papers, comparing them visually and under the microscope, I examined them under ultraviolet light. This is merely one additional step.
Here again I found that both of them fluoresced the same way.
Mr. Eisenberg. Could you explain the meaning of that?
Mr. Cadigan. Yes. Paper, along with many substances, has the property of absorbing or reflecting ultraviolet light rays differently. You can take two samples of paper and put them under an ultraviolet light, and they may appear to be the same or they may be markedly different.
Mr. Eisenberg. You mean even if they look the same under visual light?
Mr. Cadigan. Visually they may look the same and yet under ultraviolet light there may be very dramatic differences.