[pure-silver] Re: PIQUED MY CURIOSITY; was Phenidone in alcohol
- From: BILL WILLIAMS <krbill_10@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 7 May 2009 12:50:37 -0700 (PDT)
I will verify later but I believe that the DK-60 I have is actually DK-60A.
--- On Thu, 5/7/09, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
> From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
> Subject: [pure-silver] Re: PIQUED MY CURIOSITY; was Phenidone in alcohol
> To: "Pure-Silver Free" <pure-silver@xxxxxxxxxxxxx>
> Date: Thursday, May 7, 2009, 1:50 PM
>
> ----- Original Message ----- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, May 07, 2009 8:33 AM
> Subject: [pure-silver] Re: PIQUED MY CURIOSITY; was
> Phenidone in alcohol
>
>
> DEAR BILL,
> Thanks so much for the info below and looking forward to
> any
> film/time combinations you are willing to share. I
> use
> T-max 100, T-max
> 400, Tri-X Delta 100 & 400, and HP-5 and Rollei Retro
> films.
> Any suggestions you can make would be great!
> CHEERS!
> BOB
>
> FWIW, DK-60a was a very active film developer
> intended
> for photofinishing and press work. I don't know the
> difference between the original version and the "a"
> version.
>
> Kodak DK-60a For Photofinishing and Professional
> Photography
> Water (at 125F or 52C)
> 750.0 ml
> Metol
>
> 2.5 grams
> Sodium sulfite, dessicated
> 50.0 grams
> Hydroquinone
> 2.5
> grams
> Kodalk
>
> 20.0 grams
> Potassium bromide
> 0.5 grams
> Cold water to make
> 1.0 liter
>
> Dissolve chemicals in order given.
> Average development time in a deep tank about 7 minutes at
> 68F
>
>
> Compare this with DK-50 which was in production until
> fairly
> recently.
>
> Kodak DK-50 For Professional Films and Plates
> Water (at 125F or 52C)
> 500.0 ml
> Metol
>
> 2.5 grams
> Sodium sulfite, dessicated
> 30.0 grams
> Hydroquinone
> 2.5
> grams
> Kodalk
>
> 10.0 grams
> Potassium bromide
> 0.5 grams
> Cold water to make
> 1.0 liter
>
> Dissolve chemicals in order given.
> For tank development of portrait negatives dilute with an
> equal volume of water;
> develop about 8 minutes @ 68F.
> For tray development use without dilution; develop about 4
> minutes at 68F.
> For commercial use use without dilution; develop about 8
> minutes in a tank or 6 minutes in a tray at 68F.
>
> Note: these are times for c.1947 films. The
> difference
> between "portrait" and "commercial" negatives is contrast.
> At the time "commercial" negatives were developed to
> perhaps
> a paper grade or more greater contrast. These days most
> films would be developed as "portrait" negatives.
> In general the films of this and earlier
> periods
> required longer development times than modern films for
> similar contrast. Because of this some of the older
> developers develop too quickly for use with modern films.
> DK-50 has half the amount of Kodalk (sodium metaborate) of
> DK-60 and Kodak developing charts of the recent past that
> listed it required it to be diluted 1:1. There is a
> difference in diluting developer and modifying its
> contents.
> In the case of these two diluting them to get similar
> activity leaves the DK-60 with less developing agents and
> probably less capacity. Also, there may be an effect on
> grain due to the relatively smaller concentration of salts
> in the diluted DK-60, i.e., the diluted DK-60 will
> probably
> be grainier. The low sulfite is probaby also the cause of
> the increased edge effects vis: acutance.
> I suspect the amount of alkali could be
> reduced even
> further. By reducing the metaborate to around 2 grams and
> increasing the sulfite to around 75 grams you have
> something
> along the lines of Kodak's motion picture negative
> developer.
> OTOH, Bill evidently has a lifetime
> supply of the stuff and it does work in diluted form.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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