Which materials can be used as mordant for better adherence of plant derived stain to be used in tissue sections?

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Guray Akturk

I am not hundred percent sure if these recommended mordants are plant derived but they recommend two mordants as alternatives.

https://www.tandfonline.com/doi/full/10.3109/10520290903048400?scroll=top&needAccess=true

Majid Jabir

https://www.researchgate.net/deref/https%3A%2F%2Fwww.tandfonline.com%2Fdoi%2Ffull%2F10.3109%2F10520290903048400%3Fscroll%3Dtop%26needAccess%3Dtrue

Please read this paper. Detection of apoptosis in tissue section.

DOI: 10.1007/s004410000203