My DokuWiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

====== Pre-development bleach ======

To reduce contrast in prints and open-up shadows.

This bleach is applied post exposure but pre-development. The bleach primarily affect shadow regions.


===== Preparations =====
Prepare a stock and then working solution as described below:
<WRAP myRecipe>
**Stock solution A**\\
(Ferri 0.1%)
|Potassium Ferricyanide  | 1 gr            |
|Water,                  | to make 1000 ml |
</WRAP>

<WRAP myRecipe>
**Working solution**\\
(Ferri, 0.001%)\\
Mix 1 part stock solution A with 99 parts water (10ml + 990ml)
</WRAP>


===== Instructions for use =====
  - Expose print. Print with increased contrast, 1 grade extra or more.
  - Soak print in a 'one-shot' working solution of bleach, treat for approx 1-3 min.
  - Rinse print in water
  - Develop, stop and fix.
  - Wash

To alter the effect, adjust strength of the 'one shot'-bleach. Try 0.01% - 0.001% (1+9 - 1+99).