E-6 in C-41 (Cross Processing) - Archival Concerns

[bvy]

I've cross processed several rolls of slide film over the past few years not realizing that E-6 required its own stabilizer. So these films received Kodak Final Rinse only. Two questions:
1. How long do I have (roughly) before I notice any sort of degradation?
2. Is it feasible at this late date to stabilize the film?

Thank you.

 

[bvy]

Maybe the evening crowd has some ideas...

 

[Gerald C Koch]

Using the E-6 stabilizer will prevent any future damage.

 

[Photo Engineer]

However, dyes made from CD3 and CD4 have different properties. You have essentially used the wrong developing agent for the film. It may or may not be suitable.

PE