How to color the phloem and the xylem of the stem for a microscopic observation?

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Leonardo da Fonte

Depending on what you are trying to do, you might want to try looking into a Safranine/Alcian blue combination. Lignified tissue will stain red while the remainder will stain blue.

Saumitra Banerjee

I would recommend Safranin and fast green combination for a good contrast staining but follow the dehydration/rehydration processes thoroughly

Nitin Gulab Sutar

in plant what compound/complex form when phloroglucinol and HCL react with xylem / phloem/pericyclic fiber