Developer

Definition and stakes

L. W. Brownell,  Outing Magazine, Volume 45 — Photography for the Beginner…

“ Old developer that has become discolored by repeated use should be thrown away, for its action is not perfect and it is liable to stain the plates. When we find that our developer is working slowly it should be thrown out and new mixed, for developers are cheap and it does not do to risk spoiling a negative with old developer in order to save a few cents.
Tank development is often most successful and, where one is busy, is a most excellent method, as the negatives do not have to be constantly watched, and fifteen or twenty may be developed at the same time.
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Source: Wikisource

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