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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

 

3 min.
17/ 62.6
16/ 60.8
 1 min. 50 seconds
2 min. 10 seconds

60 seconds

 

  • 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.

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If you have any questions, contact us utilizing one of the following methods:

Equipment or Processing Questions:

Phone: Customer Service Department (734) 205-9421
e-mail: tech@jobo-usa.com

Repair Questions:

Phone: Repair Department (734) 205-9420
e-mail: repair@jobo-usa.com

JOBO Contacts

Telephone (734) 677-6989
Fax: (734) 677-6963
 
Postal address
P.O. Box 3721, Ann Arbor, MI 48106
Shipping Address
4401 Varsity Drive, Suite D, Ann Arbor, MI 48108
Electronic mail
Sales: sales@jobo-usa.com
Equipment & Processing Questions:  tech@jobo-usa.com
Repair Information: repair@jobo-usa.com
Shipping or Billing Questions: help@jobo-usa.com
Webmaster: webmaster@jobo-usa.com
 

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This page last updated on 03/20/02