Digital BW, The Print

Dear Steve,
                 Yes we do supply St. C's with formulation, BUT ! But not for the Somerset V.E  but for another paper of theirs. I have actually seen Greatag do a Dmax mesurement on Somerset at the PMA last year in Vegas and it ran out at 2.1 which I dont thinks is too bad, but that is of course a matter of opinion. What I was trying to point out is that diferent chemistry's can produce widely different results so it is a sensible proposition to get a combiation where the chemistry matches so as to obtain the overal results that you wish to achive.
           The problem with OBA's is that it is, as much a problem of reaction with the ink bases, as it is with the loss of the paper whiteness. With regard to the "Blue Wool Test" in this particular case  I was refering to exactly the fact that these tests were done on just the paper unprinted, it was not an ink on paper test.           

Steve Kale <stevekale@...> wrote:
I tried Somerset Velvet Enhanced in the past and also found it to be flat -
principally as a result of not being able to achieve decent dMax.  Somerset
has never had a good rap on this forum and no we are not paper chemists but
a wide body of users.

Papers with OBAs are generally avoided.  It is, I would say, the general
opinion of this forum that papers with OBAs should be avoided because of the
fear that the brighteners will fade over time and yellow paper (someone will
correct me if I am wrong).  The concern, I believe, is over the impact to
paper white rather than the fading of the inked paper.  Is this covered in
the Blue Wool tests?

Given Mr Edmunds is involved in the design of the infusion process used by
St Cuthberts to make the paper I will pull some out of the cupboard again
and take another look at it.

Steve

Please trim posts.





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