Which staining method is used for detecting Calcium in tissue samples?

The method that is specifically used for detecting calcium deposits in tissue samples is Von Kossa's method. This staining technique utilizes silver nitrate to identify and localize calcium salts in tissues. When silver nitrate is applied to a tissue section that contains calcium, the calcium ions react with the silver ions, leading to the formation of dark brown to black deposits. This is particularly useful in histopathology for assessing conditions such as calcinosis or metastatic calcification.

Other staining methods mentioned, such as Giemsa stain, Hematoxylin and Eosin, and Masson-Fontana technique, serve different purposes. Giemsa stain is predominantly used for cell differentiation and identifying certain types of cells in hematologic specimens. Hematoxylin and Eosin is a general staining technique commonly used to visualize cell morphology and tissue architecture. Masson-Fontana technique is primarily employed for melanin and argyrophilic substances. Therefore, these other methods do not effectively identify or localize calcium within tissues, underscoring the specificity of Von Kossa's method for this purpose.