The invention relates to an arrangement for preparing a liquid treatment
solution for treating photosensitive material, said arrangement including
a storage container for storing fresh treating solution to be fed to a
development compartment of a development apparatus, a supply portion for
supplying a dry component or components and/or one or several mixtures of
components for preparing the treatment solution and a reception container
for receiving a solvent, wherein according to the invention a mixing tank
is interposed between said supply portion, said reception container and
said storage container.