you will need a very dark green filter
If going this way, we may find useful to apply a desensitizer bath: Phenosafranine, Safranin-O, Pinacryptol Yellow, Pinkryptol Green.
In that way we may see much better without fogging, still we should test how those desensitizers work with a particular film. Also important is learning how the negative should look under safe light (before fixing).
Still some IR googles are a safe bet...
