Archival Processing Sequence

1. Development

To completion. Manufacturers generally recommend 1.5 minutes, but it is worth doing your own tests to ensure you are reaching the maximum black of the paper under your particular conditions. Agitation should be thorough and continuous. Choose dev. to suit paper & effect.

2. Stopbath

Sufficiently long to deactivate developer in the paper core, 10 seconds should be sufficient. Agitate continuously.

3. Fixing

2-bath fixing in a non-hardening fixer, 5 minutes in each bath for sodium thiosulphate fix- ers at normal paper strength, 2 minutes in each bath for ammonium thiosulphate fixers at normal strength. Rotate the baths, discarding the first when the silver level reaches 2.0 grams/litre – use silver estimating strips to find this.

4. Wash

15 minutes – basic wash to reduce hypo content to a low level to avoid staining in toning.

5. Selenium Toning

As a starting dilution try 1+15 with Kodak Rapid Selenium Toner. Other toners may require different dilutions for the same effect. Agitate continuously, and use gloves and/or tongs, as it is highly toxic, and absorbed through skin! Good ventilation is also desirable, and performing this step in the open air is not a bad idea, as the changes can be seen most clearly in daylight. An untoned print alongside the toning bath, in a dish of water is also useful for reference. Keep looking away from the toning print to stop your eyes adapting to the colour change.

6. Wash

5 minutes, a brief wash to prolong the life of the Hypo Clear bath. Dry using a method as recommended on previous page.

7. Hypo Clear Bath

Follow the manufacturers recommended dilu- tion, and agitate continuously. Some sequences place the hypo clear stage prior to selenium toning, or mix the Hypo Clear bath with the toner. There is actually a high thiosulphate content in Kodak Selenium Toner, and the clearing stage therefore seems best applied later in the steps, after toning.

8. Full wash

60 minutes minimum in an efficient print washer should reach a satisfactorily low level, so long as the water temperature is not too low- below 10°C a rule of thumb is to double the wash time. A basic check on washing efficiency which will detect serious problems is finding the stain producedon a washed print with HT2 solution.