What hardener should I use with the New55 PN negative?

Hardener is optional.  A teaspoon of alum (powder) per every 250 ml of Ilford Rapid Fixer is recommended to strengthen the soft emulsion of Atomic-X negative that's in New55 PN. 

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    Charles Mintz

    Are you talking about chrome alum? Getting darkroom chemicals is getting harder (no pun intended) every day.

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