A camera comprising a memory for storing at least one camera setting for each of at least one user, a user identification sensor for identifying at least one of the at least one user of the camera, and a processor for controlling the camera according to the stored at least one camera setting in response to a signal from the sensor. The compositions include microparticles, such as polymethylmethacrylate particles, and collagen as a suspending agent, wherein the collagen contains a reduced amount of low molecular weight gelatine compared to high molecular weight collagen. The device for performing the process consists of a screen basket which is cylindrical or preferably polygonal in shape and has borings in its jacket to let the defiberized material pass through, a rotatable driving shaft being arranged coaxially inside the screen basket, with blades being attached to said driving shaft, preferably in rigid connection.