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Instructions for Tetenal Mono PK RA-4 Chemicals

Mono PK RA-4 was developed to process color prints at room temperature with out the aid of special processing equipment. This chemical kit can be used in Nova print pods, drums using roller base motors, or in trays. It can also be used in JOBO's DuoLab, CPE, CPP,CPA, all Autolabs and Fujimoto paper processors by adhering to the temperature limits of the chemical kit. Mono PK RA-4 is designed to work in a temperature range between 16°c and 25° (60.8° to 77°). Development, bleach-fix and final wash times will vary with temperature.

Mixing:

The Color developer may separate into two layers during shipment. This is a normal occurrence and is corrected by always shaking from three to five minutes before mixing. When the solution is ready to be used, it will be clear. Allow the developer to stand for a few minutes to allow any air bubbles to rise.

In some applications a stop bath is recommended. Tetenal Stop Bath may be used or you may make your own solution of 3% to 5% acetic acid stop bath.

Bleach fix should be mixed thoroughly with water by shaking the solution for one to two minuets.

For Tray Processing:

Process prints in total darkness or with the appropriate color printing safelight.
Process prints using the time and temperature table below.
Agitate the prints continuously and use tongs or gloves to move the prints
Drain off color developer completely before placing the print in the stop bath.
Follow the table directions for bleach fix and wash times.

Drum Processing:

Bring the drum and chemicals to room temperature.
Process prints using the time and temperature table below. Avoid developer times of less than 1 minute.
Use stop bath immediately after development.
Rinse and dry both drum and lid carefully to avoid bleach or developer contamination

Nova and Jobo Slot Processors:

For unheated processors, like the Nova Print Pod, bring the chemicals to room temperature.
For heated units, select the select processing temperature between 16 to 25°c to process the paper
For processors without a stop bath tank, lift the paper out of the slot for 15 seconds before the end of the developer time and allow the print to drain. Place the paper in the bleach-fix and agitate vigorously.

Developer and Bleach-fix Mixing Table:

Water	Developer	To Make	Water	Bleach-fix	To Make
400ml	100 ml	500 ml	400ml	100 ml	500 ml
800ml	200 ml	1 Liter	800ml	200 ml	1 Liter
2 Liters	500 ml	2.5Liters	2Liters	500 ml	2.5Liters

Processing Steps and Temperature Table:

Color Developer Temperature °C/°F	Color Developer Time	Stop Bath or Wash	Bleach Fixing	Final Wash
25/ 77 24/ 75.2	40 seconds 45 seconds	20 seconds	50 seconds	2 min.
25/ 77 24/ 75.2 23/ 73.4 22/ 71.6 21/ 69.8 20/ 68 19/ 66.2 18/ 64.4	40 seconds 45 seconds 50 seconds 1 min. 1 min. 10 seconds 1 min. 15 seconds 1 min. 25 seconds 1 min. 40 seconds		50 seconds	3 min.
17/ 62.6 16/ 60.8	1 min. 50 seconds 2 min. 10 seconds		60 seconds	3 min.

Processing times are not as critical with mono PK RA4 as with other RA-4 developers. Color development times can be exceeded by 50 %.
Room lights can be turned on 15 seconds after the print is placed in the Bleach Fix.

Faults and Corrections:

Fault	Possible Cause	Remedial Action
Irregular spots or colors.	Insufficient agitation.	Continually agitate the print.
Blue black.	Color developer to dilute Insufficient agitation. Development time to short.	Use correct amount of water. Increase print agitation. Increase development time by 30 seconds or mix new color developer.
Dirty gray coating on print whites or light print areas.	Bleach fix time to short or exhausted. Safelight to bright.	Bleach-fix the picture once more and for a longer time or mix fresh bleach-fix. Move the safelight away from paper.
Picture has intense purple or violet color casts.	Yellow/blue safe light on, or other light source	Do not use safelight. Check darkroom for leaks.
Picture has intense blue or green color casts.	Red safe light on or other light source.	Do not use safelight. Check darkroom for leaks.
Purple colored streaks	Print exposed to light before the stop bath or bleach-fix had taken effect.	Switch room lights on later.