Blue Tint in Kodak E6 Control Strip with Fujihunt C6R Chemicals
Recently a bunch of us have managed to get hold of the C6R chemicals from Fujihunt that's the equivalent of Kodak's E-6 process. We developed our chromes using either phototherm or Jobo equipments. After a few initial failures with over-active reversal baths, most of the developed slides are looking very good. Just to be anal about the process, I've run the the Kodak's E-6 control strip through these chemicals, and I seemed to have hit a wall with the slight bluish tint on the LD and HD portion of the strip. This is inline with the observation that some of slides developed carried a tiny bit of bluish tint.
I have tried various means to try to correct the problems - lowering the reversal bath concentration, to slightly varying the proportion of Part A and B of the color developers, and even adding sodium hydroxide to the color developers. All these changes didn't change the result of the control strip too much - which in one way, is great news - it shows just how robust the E6 process is; but the bad news is that i am unable to hit the nail of the problem to get the TD and HD square to the same neutral gray found on the reference strip.
Just wondering if you guys have any pointers on what could be the issue here? Would adding starter solutions to the First Developer and Color Developer help?
You've done most things correctly in order to correct this. Low p.h is the normal culprit wrt blue cast on Kodak with CR56, the cast will be magenta on fuji film with the same problem. To fix this try a 10% aqueous solution of NaOH to the colour developer.
If you've tried this (and I can see you've used the NaOH) then it could be contamination of the first developer with fixer, or even insufficient agitation (unlikely with Jobo) too little part A in the colour dev will also cause this.
One last long shot is to buy some Fuji controls as well, remember to apply the printed corrections when you compare your strip to the reference after reading on a densitometer, you could just be looking at batch variation if you just compare by eye.
Thank you, Mark!
Since the solutions are all freshly mixed for each run, I can't think of a reason how the first developer could have been contamination by the fixer, or get consistently contaminated. I have tried about 10 runs now. AFAIK, the reason behind the contamination causing the blue tint is that the fixer acts as a catalyst, thereby over accelerating the effects of the first developer. So, I'm wondering if slowing down the activity of the first developer by adding the starter solution will help. In Kodak's documentation, it did list as the lack of starter solutions as a possible cause of blue tints.
I have also reduced the concentration of Part B by as much as 10% to see if it makes any difference, and amazingly it didn't. I have also added the equivalent of 4ml per litre of 5N NaOH, and again, it didn't lift the tint by too much visually. This is pretty frustrating. I'm going to try raising the amount of NaOH even more. I don't have a densitometer, and I think it's a good idea to get one just to be methodical about the analysis.
This whole process is so robustly consistent that it seems nothing I do changes anything. I'm going to try adding salt, soya sauce and ketchup, and i bet the result is still going to come out the same!
Getting the Fujifilm controls is a good idea, but it's pretty hard to find. The usual online stores don't seem to stock it. Even the Kodak control strips are hard to come by these days. So far, only Kull and Company has it listed. I'm going to ping them and see how it goes.
Thanks for the reply!
Are you including a sulfite-contining stop bath after the first and second developers? You must use different (separate) stop baths. A good rinse following the stop bath is also a good idea. You should measure the pH of the color developer and set it to specification (11.5 if I recall correctly, and 10.0 for first developer, but check me on those numbers).
By denying the facts, any paradox can be sustained--Galileo
Kodak and Fuji suggest different times in the first developer for their films. Are you using the correct recommended times?
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Hi, mts, PE, thanks for the suggestions.
I'm using Phototherm that has an built-in program for E6. There's a wash step after the first developer, but it uses water. I'm not sure it it is at all possible to introduce a separate stop bath.
As for the development time, I follow the instructions of the C6R faithfully. If anyone is interested, a copy of the instruction is here.
Do any of you think that starter solutions might help? In one of the Kodak documentation for E6 troubleshooting, the lack of starter solution is listed as one of the possible causes, and that's pretty much the last option that I have yet to try.
Lack of starter and the wrong 1st developer time are both possible problems.
Hi! With regards to the development time - should i try shortening or extending the development time?
Originally Posted by Photo Engineer
I have gone ahead and place the order for the starter solutions for both the first developer as well as color developer. I will give those a try as soon as the stock arrives.
Read the Kodak and Fuji documentation regarding 1st development times.
Are you sure your chemistry is in date ? I ask because if you are following those instructions faithfully are you aware that Conditioner and Stabalizer were replaced some years ago by Pre Bleach 2 and Final Rinse.
Originally Posted by losheng
I would love to provide a link to the Fuji Hunt current E6 Technical manual but the forum anti link protection really is comprehensive and I have wasted half an hour of my life already on alternatives that would usually work so the best I can do is say google for TB E6_E13_09-11.pdf its the first and only result I get.
I would also recomend you google for TIS Replacements for E6 Kits
The quote below is from it
Please note that the use of Pro6 First Developer and Pro6 Colour Developer as working Tank olution requires the use of special starter solution for each developer. This is not optional; you will not achieve a satisfactory E6 process without use of the correct starters.
Any way that could be a bit more selective as in it is preventing the link in the orginal post
An error has occurred abbandon! You must have 5 posts in order to post links. Your current post count is 0.