Every researcher unfortunately uses a different method. The classical procedure of H and E staining however is same and has been standardized. You can find the Mayer's or the Harris' protocol on https://www.protocolsonline.com/histology/dyes-and-stains/haematoxylin-eosin-he-staining/
The classical paper HISTOCHEMICAL OBSERVATIONS ON RODS AND CONES IN RETINAS OF VERTEBRATES’ RICHARD L. SIDMAN’ AND GEORGE B. WISLOCKI Department of Anatomy, Harvard Medical School, Boston, Massachusetts Four plates (32 figures) Received for publication March 22, 1954 also demonstrates the technique.