“…This instability was due to a slowly formed precipitate which results from the interaction of the dye and aniline. Among the attempts to increase this stability have been the suggestions of various nonprecipitate forming substitutes for aniline such as the slow addition of phenol (41, 95, 96, 102, 110), boric acid (88), aniline sulfate or aniline oxalate (2), glycerol (78), oxalic acid (109), or even the complete omission of the mordant from the primary stain (24, 89, 90). The most widely used formulas in the United States are those of Hucker (75) and .…”