Deterioration of Schiff's Reagent

A Periodic Acid‐schiff Technique for Staining Fungi in Higher Plants

“…It remains usable for at least 6 months in a tightly stoppered, well-filled bottle in a refrigerator. It should at all times be protected from light and air (Lhotka & Davenport, 1949).…”

A Substitute for the Feulgen Staining Technique

“…Schiff's reagent does not keep well (Lhotka and Davenport, 1949;Lillie, 1951). The staining of the nuclei of blood cells is often faint and detail difficult to discern.…”