[pure-silver] Re: Self-Made HypoClear any good?

Claudio

As I learned today, hard water causes this whitening. It's a deposit of
calcium sulfite from the hard water.





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2006-11-26 20:53, "Claudio Bonavolta" <claudio@xxxxxxxxxxxx> wrote:

> Ralph W. Lambrecht a écrit :
> 
>> I started to make my own HCA, mixing 20g of sodium sulfite to 1 liter (2%)
>> as a working solution. I noticed that when I poured the solution into the
>> tray that the last 10% or so were not as clear as the rest (the solution is
>> a week old), but it seemed to mix OK.
>> 
>> After fixing I power-washed for 5 minutes and then used the HCA for 10
>> minutes, followed by a 30 minute wash. Then I wiped the prints off
>> (squeegee) and hung them to dry. I noticed later the the wiped-off liquid
>> turned white. Apparently some of the HCA is still in the print after a 30
>> minute wash!
>> 
>> Questions:
>> 
>> 1. Does the residual HCA harm the print?
>> 2. What is the best way to deal with this?
>> 
>> 
>> 
>> 
>> 
>> Regards
>> 
>> 
>> 
>> Ralph W. Lambrecht
>> 
>> http://www.darkroomagic.com
>> 
>> 
>> 
>> 
>> 
>> 
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>> 
>>  
>> 
> Hi Ralph,
> 
> I commonly use a 20gr/l of sodium sulfite as washaid but I dump it at
> the end of the session.
> I've never experienced such milkiness but have recently received an
> email from a french guy that had such milkiness with the original Kodak
> HCA product which is supposed to last much more that the simple sodium
> sulfite.
> I've no idea what causes such milkiness ...


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