Kodak Gold 200 ISO 200 C41 color-negative film.
Developed in part A ONLY of the TCB developer ph 9.3, 20 centigrade, normal agitation. Time 30 minutes at 20 centigrade, did reach only half box speed
The developer in part A did not react as expected, apparently the initial concentration of NaOH was too low to convert the Tylenol tablets (paracetamol plus additives) into a proper developer, but a fairly high addition of ascorbic acid most likely saved the day, even at a very low pH of 9,3 in this mix.
This brew did not follow the recipe given below, since there at first try was no activity, the dosage of NaOH was doubled in the hope that activity would pick up.
This test was a least straw after the initial and original plan failed, I skipped part B entirely (30 gram Borax per liter) and used only part A for a higher concentration and more activity. Even at that I only got about half box speed.
Triplet stripe from left to right :
ISO 200, ISO 100, ISO 400
ISO 100
Triplet stripe from left to right :
ISO 200, ISO 100, ISO 400
ISO 400
ISO 100
Triplet stripe from left to right :
ISO 200, ISO 100, ISO 400
Kodak Gold 200 exposed ISO 100 developed as above
Back to the drawing board, I will now try to duplicate Michaels recipe exactly, to see if that gives better results.
Looking closer at my notes I found an interesting trend that may help explain what is going on here. I found that initial tests as a one-shot developer with relatively little p-aminophenol did not work well and results were similar to what was posted here. What I found worked was to make a re-usable version with lots of p-aminophenol and it worked to process many rolls of film. To make the re-usable version I suggest the following:
ReplyDeleteTCB Part A:
Acetaminophen - 15g (30 x 500mg tablets)
Ascorbic Acid - 6g
Sodium Hydroxide - 20g
Water to make 250mL
Let stand for 72 hours, add 5g borax and water to make 1L.
TCB Part B:
Boarax - 19g
Ascorbic Acid - 6g
Water to make 1L
Use A:B 1:9 for a normal speed (8 min) developer and 1:19 for a stand or semi-stand developer. The working strength solution can be re-used many times but I didn't determine the limit.
Also, based on your Flickr post I assume this is the film that turned the developer green. I see that often when using Kodak Gold 200 and my home-brew developers.
ReplyDeleteSorry, correction to the first comment, TCB part A should be 500mL total volume and not 1L so it should be as follows:
ReplyDeleteTCB Part A:
Acetaminophen - 15g (30 x 500mg tablets)
Ascorbic Acid - 6g
Sodium Hydroxide - 20g
Water to make 250mL
Let stand for 72 hours, add 5g borax and water to make 500mL.