Rollei Rodinal is characterised by very good contour sharpness and high emulsion speed yield. The subject contrast can be influenced by varying the dilution of the concentrate. Mixing: 1 part concentrate to 25 or 50 parts water at a temperature of 20° C. Shelf life: The concentrate remains usable for at least 6 months once the bottle has been opened if the screw top is tightly closed. When diluted for use, R09 only keeps for a short time and therefore should only be mixed immediately before use. Developing times at 20° C – Dilution 1 + 25 or 1 + 50 (Small tank processing) Agitation: Small tanks – continuously for the first minute, and then tilt every 30 seconds. The film development times listed below are guidelines. Through variations in processing the result can be influenced according to requirements.