I just shot 2 plates from 1947 and used an orange-ish filter* for the first time with this box. I developed the first plate and it was unexposed? Now, it could be my cable release misfired, It has in the past once or twice, the pin is probably not long enough. Anyway, any chance this plate is not actually fully panchromatic? labeled " Barnet Soft Panchromatic" doesn't mention a safelight…" open in absolute darkness…

* just about the same color as an amber safelight.

ps, the plates are good, I've gotten images from the other plates in the box.