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“We did essentially zero marketing, and it didn’t matter,” said CJ Bak, the developing agent for Subway in Kenya, with three stores currently and plans for 20.

It is the name of a developing agent patented by Dr. Andreson about six years ago.

If one uses hydrochinon, which is a favorite developing agent with amateurs, dilute the developer and add from three to seven drops of iodide solution.

The pyro is the developing agent, or that which gives the required strength or density, while the alkaline solution, containing the sulphite of soda, prevents the staining of the negative and preserves the pyro.

The developing agent with the pyrogallic and formic acids will keep good a very long time, longer, I think, than that in which acetic acid is used, but cannot be used as a dipping bath.