Here's a link to one post
http://tech.groups.yahoo.com/group/S.../message/14472
A search for paraffin on the ScanHi-End group yeilds ~43 results, there's some banter, but the reprographic industry has used paraffin (inert mineral oil) for decades for mounting film to scan
One consideration not discussed often is the refractive index of the mounting fluid - IIRC paraffin has a refractive index very close to film, so it forms an additive layer, which fills in scratches and imperfections in the film also, without distorting anything optically.
Don't take the above as gospel, but it's well worth researching...
peace out
Glenn
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