Hi Ernst thanks. actually I downloaded a pdf that explained the difference between brightness and whiteness and explained the meaning of nanometers. It is clearer now and so your graphs have more meaning as an initial way to make decisions about at least what paper to try out. It's a great springboard and saves a little money. But please could you tell me, you have print side +w and print side + b. Does the B and W stand for Black and white point? I could not find the definition in your description section. Also I am still confused as to what nanometers mean on the scale, the theory was understood, ie Blue wavelength? I think, but what does the scale actually mean from 400 to 700, is this the wavelenth of the RGB spectrum or just the wavelength of the Shorter Blue spectrum?
These will be the final questions, after understanding this I will be ok. Thankyou for your time.
Tot Ziens, Chris