How many times did he dye it for the photo shoot?

He staining is generally 20 times. Hematoxylin-eosin staining is called HE staining for short. HE staining is one of the most basic and widely used technical methods in histopathology teaching and scientific research. Hematoxylin staining solution is alkaline and can stain basophilic structures of tissues (such as ribosomes, ribonucleic acid in nucleus and cytoplasm, etc.). ) turns blue and purple. Eosin is an acid dye, which can dye the eosinophilic structures of tissues (such as intracellular and intercellular protein, including Lewy bodies, alcohol bodies and most cytoplasm) pink, so that the morphology of the whole cell tissue can be clearly seen. Tissue section is a very common experimental method in teaching, scientific research and pathological examination, and HE staining is the most commonly used staining method in the process of making sections.