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SF pesos b 7 be qu The following investigation was made by s i> On June 19, 1962, ited States bly Z Penitentiary, Alcatraz, made aVailable mater AT ALCATRAZ, CALTFORNIA of thé holes in the cell wall of inmate This material was forwarded to the FBI oratory by c on dated June 22, 1962, to ascertain, if possible, the length of time that the cement-appearing substance had been in use. WW He made available a sample of the white cement paint together with a sample of the turquoise prison type paint which is used in the cells. The foregoing material was forwarded to the FBI =n Laboratory by communication dated June 25, 1962, for analysis. By communication dated July 3, 1962, tnformation was recelved from the FBI Laboratory that_t erial taken out of the holes in the cell wall of inmate consisted essentially of small lumps and loose particles of neat Portland cement mixed with small particles of lime mortar, sand grain, small wood particles and paint chips. ‘The Portland cement has had some moisture in it but it was not believed to have had . enough moisture to form a slurry. The length of time the cement a4 was In use could not be determined. The white cement paint gist Submitted as a known sample utilized by the Penitentiary was sy determined to be different from the cement taken from the hole. t The particles of blue-green paint which were in the - material obtained from the hole iT coil were found ‘to. be similar in color, texture and compos nm to the blue-green paint submitted as a known sample of the paint used in painting the hole in cell and paint utilized in painting the the inmates! ie at Alcatraz. The paint chips obtained from inmatea! cells could have come from the same source. - 76 - o cpoty J7 "tl