Excellent book about Povidone

[Osmium]

Describes physical and chemical behavior, uses, analytics for soluble and insoluble povidones. On pages 49 and 64-69 it gives some qualitative and quantitative tests (including extraction information) which might be useful to determine if your product still contains PVP. Also lots of info on tabletting and formulating pills.

http://www.ut.ee/ARFA/tehnol/kollidon.pdf

[dwarfer]

Check the properties of the insoluable products around
page 130 and as follows..

[reeB_relliM]