PQ Universal paper developer

Description

A phenidone/hydroquinone universal in high concentrate: diluted 1+4 to 1+9 and used for both paper and film. One bottle instead of two different developers.

Why phenidone rather than metol

Phenidone is active in minute quantities and, unlike metol, rarely causes contact allergy — which is why modern universal developers are built on it. Paired with hydroquinone it develops quickly and gives a deep black on paper.

Two modes

On paper the strong dilutions do the work, 1+4 to 1+9, in under two minutes. For film, weaker dilutions and longer times; the exact figures depend on the emulsion, so check the manufacturer’s chart.

Questions and answers

Which dilution is the stated yield for?

The paper mode. On film, consumption is counted differently — by tank volume, used once.