Response to Thin Negatives: Wash that will revive contrast?

All the processes I know to intensify a negative (which is what you are trying to do) are permanent, and irreversible. If this is important work, make a dupliacate negative for safety.

Intensification is generally regarded as a "salvage" technique--that is, you have an important negative that cannot be re-done, and you must make the best possible print. There is always some risk of damage to the negative when doing these sorts of processes.

More importantly, if this work isn't critical, is to know why your negatives are thin.

Did you not give enough exposure? Did you not develop long enough? Was your developer exhausted?

etc.

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