Does anyone know polymers with anomalously high refractive index increment, dn/dc, as high as 0.8?

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Daniel Oladapo Olaniregun

Try Very Long fibre natural cellulosic plant cotton found in Western Nigeria Forest. Such cotton is used in making Aso Aran in Oyo state Nigeria. I have seen it severally in the forest reserve here.

Sanjeev K Manohar

Thank you for the response. How was the dn/dc measured for this system?