From: Scott Loveless > Next is fixer. Depending on the film and the age of the fixer, it > usually takes around 5 minutes. This goes back into the bottle, too. > As the fixer depletes it will take longer to clear the film. So keep > an eye on it. There are quite a few methods for determining fixer > strength. When the fixer takes more than 10 minutes I dump the bottle > and mix up another gallon. My only exception is with T-grain films. > Any fixer I use to clear T-Max or Delta films goes right down the > drain. Those films deplete the fixer more than traditional black and > white, such as HP5 or Plus-X. I don't think it's such a good idea to pour used fixer down the drains. Silver is a cumulative toxin like mercury.
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