HCA also acts as a toning stop-bath after polysulfide toning. After-toning
can be significant in the final wash without HCA. If sulfide toning is used
mainly for image protection and not for changing tonal values, HCA protects
from over-toning in the final wash.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-11-01 22:53, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "Per Ohstrom" <ohstrom@xxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Tuesday, November 01, 2005 11:25 AM
> Subject: [pure-silver] Re: Toning Question
>
>
>> Thanks, Richard, for answering my question before I asked
>> it! But I didn't receive your message until now. So, you
>> say that HCA is recommended after Viradon and KBT. Does
>> that affect the long term permanence of the print or is
>> it just for avoiding stains?
>>
>> Per
>>
> Its to avoid stains. I use HCA only because I have it and
> its easier than mixing up a sulfite bath. I have been
> experimenting with a combination toner made by mixing Kodak
> Selenium Toner and KBT. Results are good whether the HCA
> bath is used or not but the yellow color of the toner is
> immediately cleared in the HCA bath and there is no
> indication of staining or after toning at all.
> Partial toning in KBT is used for image protection
> without any subsequent steps so tone prints should be pretty
> archival.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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