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Kodak Direct Positive process for paper

Posted: Wed Jan 20, 2016 3:42 pm
by Bruce
THE CHEMICALS AND FORMULAS

The Kodak Direct Positive Paper Black and White Outfit is designed especially for those who do not want the mess and fuss of weighing and mixing all the different chemicals. Extra individual packages of developer are available for black-and-white redevelopment.
Packaged Kodak Odorless Sepia Toner or Kodak Sepia Redeveloper should be used for sepia (brown) redevelopment.
Kodak Acid Fixing Powder with Hardener is recommended if the use of hypo bath is desired.
For those who wish to mix their own chemicals, the following formulas are recommended.

Kodak Developer D-88

Avoirdupois Metric
Us. Liquid
Water, about 125 А (50 С) .............................................. 96 ounces .... 750 cc
Kodak Sodium sulfite, desiccated .................................. 6.5 ounces ... 48.8 grams
Kodak Hidroquinone ...................................................... 3.25 ounces .. 24.4 grams
Kodak Boric Acid, cristals .............................................. 0.75 ounce ... 5.6 grams
Kodak Potassium Bromide ............................................. 150 grains ... 2.6 grams
Kodak Sodium Hydroxide (Caustic Soda) ...................... 3.25 ounces .. 24.4 grams
Cold water to make ........................................................ 1 gallon ..... 1.0 liter

* Crystalline boric acid should be used as specified. Powdered boric acid dissolves only with great difficulty, and its use should be avoided.

** Caution: Dissolve the caustic soda in a small volume of water in a separate container and then add it to the solution of the other constituents. Then dilute the whole to the required volume. If a glass container is employed in dissolving the caustic soda, the solution should be stirred constantly until the soda is dissolved, to prevent cracking the glass by the heat evolved.

Dissolve chemicals in the order given.

Use full strength at 68 F (20 C). Develop 45 seconds to l minute.

Kodak Bleaching Bath-9

Water................................................................................ 1 gallon ...... 1.0 liter
Kodak Potassium Bichromate .......................................... 1.25 ounces ... 9.4 grams
* Sulfuric Acid .................................................................... 11.5 ounces ... 12.0 cc

* Caution: Always add the sulfuric acid to the solution slowly, stirring constantly, and never the solution to the acid: otherwise the solution may boil and spatter the add on the hands or face, causing serious burns.

Use full strength at 68 F (20 C) for about 30 seconds. For more rapid bleaching, however, the quantities of acid and bichromate may be increased.


Kodak Clearing Bath CB-1

Kodak Sodium sulfite, desiccated ................................... 12 ounces ... 90.0 grams
Water to make ................................................................. 1 gallon ..... 1.0 liter


Kodak Sulfide Redeveloper T-19

Kodak Sodium sulfide, (not Sulfite) ................................. 290 grans ... 20.0 grams
Water to make ................................................................. 1 gallon ..... 1.0 liter

Use full strength at 68 F (20 C) for about 30 seconds.

Re: Kodak Direct Positive process for paper

Posted: Mon Feb 01, 2016 7:23 am
by bloewy
Are these available premixed somewhere? They appear to be discontinued.

Re: Kodak Direct Positive process for paper

Posted: Wed Apr 13, 2016 1:57 am
by Woodent
Got a guy here in Moscow who nicely mixes a dry set in a neat box like this:

Image

First experiment is drying now:

Image

Top left hand corner shows what happens if you don't follow instructions or common sense and FAIL to RINSE between baths. Don't. However, it is clearly seen that a cyclist if "frozen" properly - I was shooting @1/60. The same goes for the top righ picture.

Image

Actually, both of the street photos suffer from some light spilling, probably something in my Travelwide, will need to track it later.

The bottom row is shot at home from the tripod. Left bottom image shows what happens if you forget that the exposure scale is logarithmic, not linear...


Right bottom image was exposed @ISO50 for mixt lighting of LED and energy-saving lamps. I woud say that for this developer Galaxy should be rated about ISO12-25 for such lighting.

Image

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Posted: Wed Apr 20, 2016 10:39 pm
by NikodiNBow
Thank you: I'm positive the fuel was paraffin. I will try to do another calculation for the can.

Re: Kodak Direct Positive process for paper

Posted: Sat Apr 23, 2016 3:00 am
by Stavver
Hello Bruce,

looks like some metric values are not correct, see the comments below:

Bruce wrote:THE CHEMICALS AND FORMULAS

(...)

Kodak Bleaching Bath-9

Water................................................................................ 1 gallon ...... 1.0 liter
Kodak Potassium Bichromate .......................................... 1.25 ounces ... 9.4 grams
* Sulfuric Acid .................................................................... 11.5 ounces ... 12.0 cc (my calculation is 89 ml, see the Kodak Sodium sulfite with 12 ounces = 90 grams)

(...)

Kodak Sulfide Redeveloper T-19

Kodak Sodium sulfide, (not Sulfite) ................................. 290 grans ... 20.0 grams (here I got 5g, see the Kodak Potassium Bromide with 150 grains = 2,6 g)
Water to make ................................................................. 1 gallon ..... 1.0 liter