There should be no bumps in the curves at all. They should all have straight line mid portions with no irregularities. See the D&Z article for full sets of curves.
I didn't say that the results were bad, I said that VC papers should NOT be a roller coaster
... However, since filters are not perfect, and there is 'punch through' of the blue light into the green sensitive layer, you get what is effectively 'cross contamination' of exposure and therefore bumps in what might otherwise be straight lines unless you are very careful and use the right emulsions.
Most manufacturers list the ANSI speeds for their papers in their technical information. These are the best indicator of speed.
if there is any blue sensitivity to the green layer, then regardless of the cut of the filter it will be virtually impossible to entirely eliminate the effects.
...
It can be translated to Excel but only the numbers can go across,
Excel hasn't got a linear interpolation function [@linterp()]
It is TREND, isn't it?
The actual curve that represents an H&D response by analog photographs is called a cubic spline.
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