Orcein (Synthetic) is a red dye used in microscopy as a mordant for the staining of flagella, as well as for detecting elastic tissue in sputum.酸性pH時呈紅色，堿性pH時呈藍色
Orcein (Synthetic) is a red dye used in microscopy as a mordant for the staining of flagella, as well as for detecting elastic tissue in sputum.Red in acidic pH and blue in alkaline pH
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