Used in Wolbach's Giemsa Method Wolbach, Todd, and Palfrey (1922) Nuclei, collagen. References are Wolbach, S.B., Todd, J.L. and Palfrey, F.W., The Etilogy of Pathology Typhus, Harvard University Press, Cambridge, MA., p. 13 – 14,c 1922 and Luna, L.G., (ed), Manual of Histologic Staining Methods of the AFIP, 3rd Edition, McGraw-Hill, Y, p. 119, c. 1968