Recent content by Relayer

Alan, may be you interesting with my result about stability of ascorbate development. In my experiment I found that any combination of Ascorbic Acid + Box is unstable and pH very changed after 1-2 week. But if you replace AA with Sodium Ascorbate - this solution have stable pH. PS I experiment...

I known only one working monobath formula without hydroxide Sodium sulfite 50g Hydroquinone 4g Sodium Carbonate ang 80g Phenidone 1g Sodium Thiosulphate 70g Water 1l starting dev.time. Neopan SS 100 @200 7min

Sorry, I was out of home and can't reply. You right - Phenidone can be substituted with ~10x amount of Metol. But note that Metol in solution is acidic, so you need to adjust pH and possible decrease amount of metabisulfite. Also Phenidone give more speed and shadow details compared to Metol...

Some time ago I was research some pH-stability issues in ascorbate devs. 1st replace ascorbic acid to sodium ascorbate or ascorbic acid with valid amount of sodium carbonate for produce sodium ascorbate. 2nd - make your buffer solution. For pH=9 try ~10g/l of Borax, or borax+sodium carbonate

Odourless rapid fixer must have acidic to neutral pH. Pyrocat-HD and other stain developer require neutral to alkali fixer pH. Good choice will be rapid fixer with slightly acidic pH in range 6-7. Some of my formula for rapid fixer without ammonium thiosulfate: RF-4 neutral odourless rapid...

if you interesing PC two bath - see (there was a url link here which no longer exists)

I think that last formula for Rodinal from digitaltruth is totally wrong! Compare it with old correct formula http://web.archive.org/web/20120827164859/http://www.digitaltruth.com/data/rodinal.php

while you decrease sulfite or increase metol - you decrease pH of bath A and result activity decreased. so you need keep pH while decreasing amount of sulfite. buy cheap pH meter, decrease amount of sulfite to 40-50g/l and add some alkali like sodium carbonate to keep pH

I think that level of sodium tiosulfate in your 1st dev is very low. Typically value must be 3-8g/l. More preferred use potassium thiocyanate in concentration 2g/l. Without correct amount of halide solvent such as tiosulfate/thiocyanate you always have dark highlight. good starting point is here

You can buy all chemicals required for this developer in PF.

Kodak 5222 Double-X @800 in RD-201 3+3 min body: Olympus OM-4, lens: Vivitar (Komine) Close Focus 2/28 @11

Arrived my pH-meter and I can make some measurement. Clearing time is relative to Agfa-304 clearing time. I claim: increasing amount of Ammonium Chloride from 50 to 85g/l in Agfa-304 make fixer in 2 times faster. This improvement not depended from pH or amount sulfite/metabisulfite. Usage...

This is the film scan from my Epson Photo 4180 where you find this info ?? fresh Double-X still available for purchase why high? 1% solution of sodium citrate have pH=8.5 and very good buffer. Sodium Citrate with Borax used in Agfa Final and Foton #10 developers. thank you for suggestion...

Hello After various experimenting with PC developers I want to share following recipe RD-105 Sodium Sulfite 50g Ascorbic Acid 8g Phenidone 0.15g Borax 15g Sodium Citrate 10g Potassium Bromide 0.5g Water 1l pH=8.6 The developer has a strong buffer on the basis of Borax and Sodium...

Harold, Agfa-47 use 6g Sodium Carbonate monohydrate = 5.1g ahydrous. so D61a 1+1 use by 10% more sodium carbonate than agfa-47. I think that this isn't very important