PE:
You are of course right, although it probably doesn't hurt to point out specifically that that is one of the results one of adding more filtration.
I have to remind myself of that result, because:
a) I haven't done much colour printing recently; and
b) A lot of the colour printing I did in the past was on equipment that automatically adjusted the exposure to keep density the same, when filtration was changed to adjust colour (leads to bad habits, I know).
CJB:
Keep up the good work - it is great fun, isn't it.
Matt