To prepare stock developer, dissolve the contents of part A (the smaller bag) in about three-quarters of the total
solution volume (see carton) of warm water at about 40ºC/104ºF. Stir until most of the part A powder has
dissolved, continue to stir while gradually adding the contents of Part B (the larger bag). Keep stirring until no
more powder dissolves. (NB it is normal for a few grains of powder to remain un-dissolved.) Add cold water to
make up to the final volume (see carton) and stir. Allow to cool to room temperature, nominally 20ºC/68ºF, the
developer is then ready to use.
Sometimes the white powders may contain some discoloured or darker particles. This is perfectly normal and
will not affect the final development.
As most water drawn from pressure mains is highly aerated, we advise that users draw off the water they need
and leave it to stand for a few minutes before using it to make up developers.