Richard-
We use Resolve (available through Baxter and other scientific catalogs).
It's i.r. is 1.515 and it comes in a nice package that makes it easier to
use than the old Zeiss bottles. One caution, it appears to polymerize
with some Zeiss oils to leave a gross scum on your objectives if you try
to mix the oils.
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Paul Goodwin
Image Analysis Lab
FHCRC, Seattle, WA