The best case fractions I've been able to make in Frame have been with a
fraction font, like Helvetica Fractions or New Century Schoolbook
Fractions. Other expert fonts may contain fraction characters. You can
make your own using a regular text font, by using superscript, slash,
subscript, but they come out pretty cheesy, IMO. A true case fraction
uses a slash that leans a little more than a regular slash, and the
numbers are a slightly different shape than full-size numbers.
Frame 8 should allow access to the Fraction Slash that's present in most
fonts but accessible only to Unicode-aware apps. As well, any fonts that
have true supers and subs (also only available to Unicode-aware apps
unless it's an expert font) would improve roll-your-own case fractions.
--
Kenneth Benson
Pegasus Type, Inc.
www.pegtype.com