Digital BW, The Print

Op 13-1-2011 21:41, john schreef:
>
> What is the non oba whitening agent that Canson is now using? It certainly looks good from here without producing metamerism apparently.
>
> john
>
>

There are endless varieties of whitening agent mixes and strategies to 
use them and without a really good scientific radiospectrometer around, 
speculation is the only option:

More a mix of several components is my guess, clean cotton fibers, and a 
mix of some TiO2 with more Baryta throughout paper and coating,. little 
addition of calcium carbonate, kaolin, etc whitening agents as they are 
less effective. I do not see the typical drop at the UV side of FBAs or 
TiO2. Moab Entrada Natural is almost alike but shows that little drop of 
TiO2 at the UV end.

Baryta while having better spectral white reflectance than TiO2 is not 
as opaque as TiO2.so if your paper base isn't that white already you 
would use TiO2 to compensate that. Baryta is a better combination with 
FBAs as it is less opaque and doesn't cut UV light. FBAs are used to 
make a cooler paper or as a cheap way to  compensate a cheap, warm paper 
base. EEM for example.

BTW, Epson, Canon, Tecco qualities are added to SpectrumViz. The last 
will be extended (proofing papers mainly) and Red River paper samples 
will arrive soon. I still need more Epson and Canon qualities. An 
interesting Canon RC paper is the Canon Heavyweight Satin Photographic 
Paper 300gsm that scored so good in Aardenburg testing but isn't in my 
collection. Paper white could have been preserved better but it was a 
very good combination with the Lucia pigment inks. HP's Prof Satin is 
then a poor competitor.

-- 
Met vriendelijke groeten,   Ernst

New: Spectral plots of +220 inkjet papers:
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm

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