I'm making internegs with Kodak color neg sheet film then printing them onto Fuji CAII. It's a whole
new learning curve since the demise of Ciba, and way too complicated in nuances to describe here
if one expects very high quality results (I do). But it can be done. A dedicated interneg film is not
necessary, and would be obsolete anyway. But other than that general remark, the details get fairly
technical.