Re: Fortepan

Thank you Sandy.

I am new to the list so please don't mind me if I seem a bit out of sync.

Regards,

John

> John,
>
> The stain produced by Pyro developers is a UV blocker and results in
> more contrast because it is greater in the highlights than the
> shadows.
>
> This is explained in some detail on p. 3 of my article on Pyro
> developers. Go to http://unblinkingeye.com/Articles/PCat/pcat.html
> and for the question of the impact of stain with different processes,
> which is really quite complicated, see page 3.
>
>
>
> Sandy
>
>
>
>
>
>
>> Sandy,
>>
>> I was responding to the email below. Where you say using ABC does not
>> produce a lot of stain. I am confused by your paragraph. You essentially say
>> that by having more film stain you get more contrast...? I was just seeking
>> clarification because I have never used Pyro in conjunction with UV
>> processes.
>>
>> Regards,
>>
>> John
>>
>>
>>> John wrote:
>>>
>>> Hello,
>>>
>>> I am bit confused with this line of questioning. Are you saying that
>>> PyrocatHD has less of a staining effect, thus it exposes faster under UV
>>> processes?
>>>
>>> Regards,
>>>
>>> John
>>>
>>>
>>>
>>>> I am confused by the question. I don't remember anything like that
>>>> being mentioned in my exchange with Cor.
>>>>
>>>>
>>>> Sandy
>>>>
>>>>> Cor
>>>>>
>>>>>
>>>>> Yes, I have been testing with Pyrocat-HD, and also with ABC Pyro. ABC
>>>>> gives much larger grain than Pyrocat-HD but develops more contrast
>>>>> for blue sensitive processes like AZO and graded papers. On the other
>>>>> hand ABC does not produce a lot of image stain so for UV processes
>>>>> you get more contrast with Pyrocat.
>>>>>
>>>>> Sandy
Received on Thu Mar 4 11:05:51 2004