Representative Boggs. Right. I understand now.
Mr. Eisenberg. Can you explain why paraffin is used? What is the action of the paraffin?
Mr. Cunningham. Well, the warm paraffin has the effect of opening up the pores of the skin and many times material that you cannot get off from washing will be picked up in the sticky paraffin. As it is cooling, the dirt and the foreign material on the hands will become embedded in the paraffin.
Mr. Eisenberg. So the paraffin acts as a base to pick up——
Mr. Cunningham. It acts as a medium in which the foreign material is picked up from the hands.
Mr. Eisenberg. When you add the reagent, what is considered to be a positive reaction?
Mr. Cunningham. It turns a blue color.
Mr. Eisenberg. That is the cast? When you say "it," it is the cast?
Mr. Cunningham. Well, specks on the cast.
Mr. Eisenberg. Dots?