Abstract: A tempering arrangement for containers, particularly for bottles with photo-developing chemicals, has a tank for accommodating a tempering bath and having an opening for inseting a container, an abutment provided in the tank and engageable with the container in an end position of the latter inside the tank, and two guiding formations provided in the interior of the tank and spaced from one another by a distance which is smaller than the transverse dimension of the container. Thereby, the container and/or the guiding formations deform during the insertion of the container into the tank.