OK I was using an unfamiliar camera, so I did not get to expose the entire roll. But as luck would have it I did capture the critical times, left to right: 20, 30 & 40 seconds.
We can see that at 20 seconds the purple is still holding on. At 30 seconds we see that the purpleness is beginning to break down. And by 40 seconds the purple is losing! So this explains why my 1 minute exposures didn’t work This also reinforces that this particular film is not suitable for Pinholes. Now we can put that to rest and return to Portra for Pinholes! The Lomo Purple Fettish has ended!