Digital BW, The Print

Barium sulphate used to be known as barytes or barite (among other 
names) but in photography the paper made using a layer of barium 
sulphate (applied as a suspension in gelatine) has been known as baryta 
paper for over a hundred years. It isn't a clay at all, clays - 
including pipeclay - are hydrated aluminium silicates. I think all fibre 
base photo papers were baryta papers, at least within living memory. Not 
urban folklore, but what all the text books said. Clay fillers are used 
in some non-photographic papers.

Titanium dioxide is generally preferred as a white pigment for inkjet 
papers - it is the most commonly used white pigment for other purposes 
also. I don't know of any reason to suppose that baryta would give 
better results, though again I don't see any reason why it shouldn't be 
ok. Harman are of course used to coating paper with baryta, so it may 
fit better into their manufacturing process, using the same coating 
machines as their photographic paper.

Peter

Peter Marshall
_________________________________________________________________
My London Diary	              http://mylondondiary.co.uk/
London's Industrial Heritage: http://petermarshallphotos.co.uk/
The Buildings of London etc:  http://londonphotographs.co.uk/
and elsewhere......



djon43 wrote:
> 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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