Coffee, Tea, Or Vitamin C. Kitchen Chemistry In The Darkroom (Shutterburg) · Ссылки

Must read. Some sample recipes:

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Coffee Developer

8 oz of water
4 teaspoons of instant coffee crystals
2 teaspoons of washing soda
Stir the ingredients until uniform, then develop film for 25 minutes, agitating every 30 seconds.

Vitamin C Developer

8 oz of water
8 vitamin C tablets (1000mg each)
5 teaspoons of washing soda
Develop for 30 minutes, agitating every 30 seconds.

Stop & Fixer

Stop bath: a dilute vinegar solution works well.
Fixer: ordinary saltwater will do.