Re: Epson R2400 inks density
Alberto Novo schreef:
It depends on the bibliography. Someone else extends this range up to
400 nm, but I think this is not so important for our photographic
UV-A region is from 320 - 380 nm.
The minimum absorption of the yellow ink is at about 340 nm (not 440
nm),M and C have their maximum at 320 nm (not 420 nm) in the UV-A
You are right, that was I was thinking while my hand was digiting (an
example of Jekill-Hyde effect?). I would not trust so much what is
happening at wavelengths lower than about 330 nm, because of the
strong absorption also from Pictorico. For me, there is too much noise
(I0 too low) for a good representativeness of the data.
The spectra are useful in the frame of the recent discussion about the
opacity of the different hues.
it is not useful to look at the curves above 380 nm. for Pt or Pd.
For silverprinters it would be very interesting if you could complete
the data with the curve of Pyro stain.(stepwedge with and without Pyro)
I do not develop with pyro. Anybody would provide me a sample of pyro
step wedge? If so, and if my friend is so kind do make an extra
effort, I could give you a reply. Otherwise, try to give it to another
chemist working with a specrophotometre.
So the M and C inks are the best blockers in this case at 350 nm.
G and C, not M and C.
For people like me who only have Y,C,M,R,B and K inks best blockers are
M and C, but you are absolute right when you have also G ink.