Mr. EISENBERG. You mentioned before the thickness. How did you measure the thickness of the tape and paper? Mr. CADIGAN. With a micrometer. Mr. EISENBERG. How sensitive is it? Mr. CADIGAN. It reads to four places. Mr. EISENBERG. How sensitive? Mr. CADIGAN. Four decimal places. Mr. EISENBERG. Is that one-hundredths? Mr. CADIGAN. That would be one ten-thousandths. Mr. EISENBERG. And they were identical in that measurement? Mr. CADIGAN. Yes; I measured both the paper sack, Exhibit 142, and the known paper sample, Exhibit 677, at 0.0057 inch, that is fifty-seven ten-thousandths. Mr. EISENBERG. Go ahead, Mr. Cadigan. Mr. CADIGAN. Do you want me to discuss this replica sack yet? Mr. EISENBERG. You mentioned a replica bag? Mr. CADIGAN. Yes. Mr. EISENBERG. Could you explain what that is? Mr. CADIGAN. Yes; this is Commission Exhibit 364. It is a paper sack similar to Commission Exhibit 142. It was made at the Texas School Book Depository on December 1, 1963, by special agents of the FBI in Dallas to show to prospective witnesses, because Commission's Exhibit 142 was dark and stained from the latent fingerprint treatment and they thought that this would--it wouldn't be fair to the witness to ask "Did you see a bag like that?" So they went to the Texas School Book Depository and constructed from paper and tape a similar bag. Mr. EISENBERG. This was made December 1? Mr. CADIGAN. December 1, of 1963. Mr. EISENBERG. Or some 9 or 10 days after the assassination? Mr. CADIGAN. Yes. Mr. EISENBERG. Was the paper obtained from the same source? Mr. CADIGAN. Yes; from the same room. Mr. EISENBERG. The same room. Did you examine this paper to see how it compared--that is, the paper in the replica bag, which has already been admitted as Commission Exhibit 364--to see how it compared with the paper in the bag found on the sixth floor of the TSBD, which is Commission's Exhibit 142? Mr. CADIGAN. Yes. Mr. EISENBERG. What was your conclusion? Mr. CADIGAN. That they were different in color, visual color, felting--that is, the pattern that you see through transmitted light, and they were different under ultraviolet light. Mr. EISENBERG. So that these two papers, which were obtained within 9 or 10 days from the same source, could be distinguished by you? Mr. CADIGAN. Yes. Mr. EISENBERG. Have you brought an ultraviolet light source with you? Mr. CADIGAN. Yes. Mr. EISENBERG. Could you show the Commission the difference between the three papers? (Discussion off the record.) Mr. EISENBERG. Now, we have been unable to find a plug for this ultraviolet machine, so we will temporarily or perhaps permanently bypass this examination. But did you find that two of the papers look the same under the ultraviolet and a third looked different when you examined it under ultraviolet? Mr. CADIGAN. Yes; that is correct. Mr. EISENBERG. Which two were the identical and which was the different one?