Hi all: I have encountered this exact issue, but only on certain color negatives. The affected negs are 30 years old I have no idea what type of film. They also now have a greenish tint when scanned. Wondering if Chris had any issues after washing, and what the effects of trying to stabilize with Flexicolor Final Rinse/Stabilizer instead of Stabilizer III might be.
Thanks for any input!
Bert
ps. I've attached an image. Note: this was scanned while still in the Printfile sleeve hence the muck.