Substractive bleach for overexposed or fogged film.

Substractive…

Prepare stock solutions as described below:

Finally, prepare working solution as specified below:

1. Soak the film in water.
2. Put the wet film in a tray of working solution, agitate carefully.
3. Inspect and remove film from tray as soon as density is sufficiently dense, or slightly before.
4. Apply a quick rinse in water to abort further bleaching.
5. Inspect and repeat if needed.

Mix 10-14 parts of water with 1 part of A and 1 part of B.

For a weaker solution, keep proportion of part A and part B and dilute in more water.

\begin{formula}[title=Farmer's Reducer (Kodak R4b), description=Proportional: for overdeveloped film] \formulasectionsolutions \begin{multicols}{2} \begin{ingredientslist}[title=Förådslösning A, numcol=2] Vatten,& 500 ml
Potassium Ferricyanide,& 7.5 gr
Water to make& 1000ml \end{ingredientslist} \columnbreak

\begin{ingredientslist}[title=Förådslösning B, numcol=2] Water, & 500 ml
Sodium Thiosulphate (Hypo),& 200 gr
Water to make& 1000 ml \end{ingredientslist} \end{multicols} Dilution: Use parts A and B separately.

\formulasectioninstructions Usage: Immerse a wet negative in Part A for 1-4 mins, agitating gently. Watch the action carefully and remove the negative as soon as the desired density is achieved. Then immerse in Part B for 5 mins, remove and wash thoroughly. Notes: This process may be repeated as required. For general fogging, dilute Part A with 50\% water. Both solutions have a long shelf life and can be stored for future use. \end{formula}