After using an old ORWO FO5 film, expired perhaps 30 years ago, I tried with its newer incarnation made by Wephota. And got three strange effects:

(pictures below scanned as reflective)

emulsion side

base side

- most exposed parts look like not fixed, in reflecting light they are milky grey, regardless how long in fixing bath; this is visible mostly from the base side

- there is an irregular silver frame around the edges - its width depends on how long the film was developed (in Adox R09)

- the films colour fixing bath to yellow (however without affecting fixing)

All three effects are replicable. I'm just curious...