Quote Originally Posted by Photo Engineer View Post
IIRC, Ilfoflex makes slides from slides!

Ilfoflex from Ilford has an emulsion for processing in RA-4. In the standard neg/neg process it forms a positive. However it has an opaque white base.

The material which seemingly is refered in a post above is Ilfoclear the one-pass version of this material and coated on transparent base.