Practice question · True or false
An acid stop bath does nothing that a plain water rinse does not also do.
Hints
- Consider what happens to the pH in each case, and what reaches the fixer.
- One of them halts development at once and one merely dilutes it.
Show the answer
False
Why
False. A water rinse dilutes the developer and slows it; an acid stop bath drops the pH and halts it immediately, which matters most for short development times. It also neutralises the alkali that would otherwise be carried into the fixer and exhaust it early.
Practise Developing the Negative
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