Digital BW, The Print

Ernst and John, thanks.

Reading online and in your helpful posts, "baryta" is the common 
misnomer for the clay coating that uses a barite additive to create a 
surface color, including both warm and bright white. 

It appears that neither the clay substrate nor its barite that 
ultimately defines inkjet detail resolution, but rather the type of 
top layer. 

I find branding/hype/folklore/pricing interesting. It was common 
knowledge years ago that the best papers, including Dupont Varilour 
and Agfa Brovira/Portriga, had a "baryta" clay coating, and we 
understood this to be almost as important as the amount of silver 
laid on top of it. Was this urban folklore or truth? :-)

Even if I could afford Harman in the sizes I like, I'd compare to the 
MC Lustre simultaneously, hoping to save several dollars per sheet 
for comparable quality.

Whose hype is most accurate, Inkjet Art's or Harman's? 


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla 
<E.Dinkla@...> wrote:
>
> djon43 wrote:
> 
> > Harman asserts they're alone with baryta. 
> > 
> > Is some clay other than baryta used? 
> > 
> > Baryta's only advantage vs other clays(the reason Kodak used it 
for
> > Kodabromide)was its natural whiteness. It was called "pipeclay" 
in the
> > Royal Marines of the 18th century, used to whiten uniforms (just 
a tidbit)
> > 
> > The "fineness" would be irrelevant, since it's ground to whatever
> > degree is necessary.
> 
> I wouldn't call Barium Sulphate/Sulfate a clay. It isn't pipe 
> clay. It is more an ore. Barium Sulfate should be called 
> Barite or Baryte and not Baryta which is Barium Hydroxide. The 
> last you wouldn't like to use as a coating as it is a strong 
> base and water soluble.
> 
> http://en.wikipedia.org/wiki/Baryta
> 
> http://en.wikipedia.org/wiki/Barite
> http://www.sharlot.org/archives/photographs/19th/book/chapter_2.html
> 
> The last link describes the use of Barite as a whitener for 
> paper since the 1820's and as a whitener for photographic 
> paper since1880.
> 
>