> 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.
>>
>>
>>
>
>
>
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