Paper Chemistry Diagnostics
Home Up Film Chemistry Diagnostics Paper Chemistry Diagnostics Visual Inspection & FAQ Film Visual Inspection & FAQ Paper

RA paper developer diagnostics

PH value for paper developer: 10.10.05

Part A: Antioxidant. It prevents your developer from oxidation.

Part B: Developing agent. It performs the colour developing function.

Part C: For PH control. It gives you the correct colour.

Symptom

Cause

Correction

Yellowish colour on unexposed portion. Over developed. Add density reducer, check PH. Adjust replenishment rate.
Pictures look flat, or purple colour in the black area Under developed Add density booster, check PH. Adjustment replenishment rate.
Prints too magenta, can be corrected, colour balance normal. PH too high. Use PH reducer.
Prints too green, can be corrected, colour balance normal. PH too low. Use PH booster.
Prints too blue, can be corrected, colour balance normal. PH too high on both film and paper developer. Adjust PH.
Prints too yellow, can be corrected, colour balance normal. PH too low on both film and paper developer. Adjust PH.
Prints too cyan. Film developer in trouble. See C41 film developer diagnostics
Prints too red, can not be corrected. Paper developer contaminated. Discard and restart new paper developer.
New developer, prints too magenta, too dark. No starter. Use starter. Dilute with water if necessary.
Red Colour is brownish, other colours and contrast are good. Light source lack of cyan colour. Replace light bulb.
Filter plugged frequently. Low utilization. Use antioxidant.

Paper bleach/fix diagnostics.

PH: 6.50.5

Greenish colour on yellow. Dark red colour on red. Blue cast overall. Insufficient Bleach. Add bleach booster.
Brownish colour on black. Over bleached. Reduce bleach time, or temperature, or dilute bleach/fix.
Muddy deposit. Oxidation. Use Bleach/fix antioxidant.
Black tar. Too much developer carry over, Switch to Hi-Tech chemistry, only

Hi-tech chemistry has zero tar.

 

Hi-Tech Photographic Chemistry
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Email: fablenatural@gmail.com