Is it true that a stained slide will appear pink at a more alkaline pH?

A stained slide appearing pink at a more alkaline pH is not correct because the color reaction of many common stains, such as those used in hematology or histology, is influenced by the pH of the environment. Stains like eosin in hematological preparations exhibit their characteristic pink color in more acidic conditions.

In alkaline conditions, the color can alter due to changes in dye ionization and the chemical environment. For instance, as the pH increases, some stains may lose their vibrant hues or shift to different colors, which could be more neutral or even appear colorless, depending on the specific dye chemistry and its interaction at varying pH levels.

Hence, the statement that a stained slide will always appear pink under alkaline conditions does not hold true; therefore, the answer is false.