i'd rather use the real-deal instead of filters,
i never use filters ( except for a center filter )
and i can't stand filters ...

maybe i will look into ilford ortho plus it seems to be what i am looking for ...

i don't think that ortho films had dyes in them, it is kind of like liquid emulsions you get in a bottle
or a home brew emulsion ( bromide / iodide ) ... maybe i am wrong ? ( i am wrong a lot )