Summary
Based on experiments on agarose gels and tissue, a procedure has been developed which greatly improves the sensitivity and the specifity of the Kossa method for demonstrating calcium in tissue. Tissue calcium is immobilized by acetonic oxalic acid, which simultaneously removes the other sorts of anions capable of precipitating silver ions (e.g. phosphate, carbonate). The resulting submicroscopic grains of calcium oxalate are converted first into silver oxalate then into metallic silver by a treatment with silver nitrate followed by an ultra-violet irradiation (Kossa reaction). These submicroscopic metallic silver grains are enlarged up to microscopic visibility by means of physical development, which makes the staining highly sensitive. Costaining of the argyrophil sites in the tissue is totally suppressed by various tricks, which render the silver staining selective for calcium.
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Gallyas, F., Wolff, J.R. Oxalate pretreatment and use of a physical developer render the Kossa method selective and sensitive for calcium. Histochemistry 83, 423–430 (1985). https://doi.org/10.1007/BF00509204
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DOI: https://doi.org/10.1007/BF00509204