A one-part photographic developing concentrate comprising: a paraphenylene diamine color developing agent; and a water-soluble organic solvent, wherein a molar ratio of sodium ion to potassium ion is at least 3, and a molar ratio of sulfate ion to carbonate ion is at least 0. The method includes, for example, receiving a communication from andor transmitting a communication to, an event customer, and optionally updating a database to reflect the communication. To reduce the risk of discharges, it is proposed to connect the ring to an earth potential via a high-impedance resistance, so that the ring assumes a potential which lies between the high-voltage potential of electrodes for the external charging and the earth potential of the bell. The stitching support is configured to move during the stitching process approximately in the same direction and at least approximately at the same speed as the conveying device.