Mr. Redlich. This is what is popularly referred to as the paraffin test?
Mr. Gallagher. Yes; it has been popularly referred to as the paraffin test.
Mr. Redlich. And your testimony is that these casts had been washed by the time they reached your possession; is that correct?
Mr. Gallagher. Yes, sir.
Mr. Redlich. Would you continue?
Mr. Gallagher. The deposits found on the paraffin casts from the hands and cheek of Oswald could not be specifically associated with the rifle cartridges. The casts from Oswald bore elements—namely, barium and antimony—which were present in the powder residues from both the rifle, and revolver cartridges. No characteristic elements were found by neutron activation analysis of the residues which could be used to distinguish the rifle from the revolver cartridges. In view of the fact that the paraffin casts were not made until after the reported firing and handling of the fired revolver, no significance could be attached to the residues found on the casts other than the conclusion that the barium and antimony in these residues are present in amounts greater than found on the hands of an individual who has not recently fired or handled a recently fired weapon.
Mr. Redlich. You mentioned in your answer, Mr. Gallagher, that the elements which you found present on the paraffin casts, which were also present on the spent cartridges found at the Texas School Book Depository, were the elements barium and antimony; is that correct?
Mr. Gallagher. Yes, sir.
Mr. Redlich. In your opinion, what is the source of the elements barium and antimony on these cartridges?
Mr. Gallagher. Barium and antimony are residues left from the spent primers in the cartridges.