Sorry to keep harping on it, but were talking about amounts of light not wave length or color of light. If adding equal part magenta and yellow are "neutral" why would paper companies list suggested filtration for specific filters for color head enlargers be a combination of yellow and magenta? If adding equal parts yellow and magenta were neutral then a print at 10 yellow, 50 magenta would be the same as a print at 40 magenta. Or 100 yellow and 50 magenta would be a 50 yellow. Obviously having filter combinations of magenta and yellow is what makes the filter, not what cancels
it.
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