Clearing/hardening solution for Type 665 negatives

[Sean]

There is a non-official formula for clearing and hardening T-665 film. It is a combination clearing/hardening solution for Type 665 negatives that does not require the clearing bucket. It was published in an article in Popular Photography, November, 1976, and reported in Adams' book. This formula clears and hardens at the same time, and allows the photographer to carry around a smaller container of solution in the field and not worry as much about the negatives.

Ingredient
Amount (Metric)
Amount (English)

Potassium alum
30 gm
1 oz.

Sodium sulfate (not sulfite)
90 gm
3 oz.

Water
1 L
1 qt.


Note that this formula uses sodium sulfate not sulfite. This formula can be used on Type 55 negatives if the 3 oz. of sodium sulfate are replaced with 60gm (2 oz.) of sodium bisulfite, but supposedly this solution has an "obnoxious odor."