Removing Laboratory Stains from Hands and Glassware 429 



picric acid — lithium iodide or carbonate, aqueous. 



potassium permanganate — dilute sulfurous acid, HCl, oxalic acid or hy- 



posulfite. 

 safranin and gentian violet — difficult to remove; try acid alcohol. 

 silver — Lugol's or tincture of iodine, followed by sodiimi thiosulfate. 

 Verhoefj's — 4% aqueotis citric acid {Hull and Wegner, 1952). 



Teaching Films 



Motion pictures can be of considerable value to instructors of labora- 

 tory methods. See especially: "Pathology Film Reviews" in Laboratory 

 Investigation (\'ol. 9, Xo. 5, Part II, September-October, 1960). This 

 lists motion pictures for education, research and recruitment, reviewing 

 the content of the films, type of audience, where distributed or loaned. 

 Samples are: "Aiuopsy Technique," "Compound Microscope," "Cyto- 

 technologist's Role," and "Career: Medical Technologist." 



