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Monday, 20 March 2017

Finding the edges of Eukobrom AC

One open ,One untouched.
I have some good and bad news concerning Tetenal's Eukobrom AC. I have been pushing the developer to find it's limits. Without knowing where the edges are you cannot be sure that you are getting the optimum usage.






Used and depleted




The good news is that two litres of diluted developer at 1 to 9 stored in a slot processor will remain usable for up to six weeks. Obviously this will vary depending on your circumstances. Also as the developer gets older the solution becomes more brown. Along with this it imparts some of this colour to the photograph by producing a subtle chocolate brown warmth in this case with Kentmere select RC gloss. A paper I have been using alot.






The bad news is, while I have been involved in seeing how long a working solution will last, I forgot to mark the stock bottle with an 'opened on date'!. As a result 800mls of unused developer has been thrown away. The first time I have had to do this ever! 
Continence from open
bottle

    
I discovered this 'error' at the start of a printing session. The existing developer was tested for usability and found to be no longer viable. So I made up a new batch to find that this was also depleted. I was suspicious that the open bottle was off by the colour but made up a new batch anyway. In the past with other traditional developers the colour does not always indicate that it is exhausted. It took time to find out for sure as the new developer was producing a very soft test image without any contrast. I was using Kentmere paper, not known for being on the soft side and very quick to produce an image when placed in the developer, seconds in fact. In this case it still was not right after two minutes. After several attempts it was dumped. Not impressed to say the least.




Test Prints from open bottle of Eukobrom AC 


Not to worry I had a new unopened bottle. However on pouring the new bottle into the measuring jug this was brown in colour as well. Not the slight orange colour I was expecting. Now I was angry. I made up a batch anyway and to my surprise I was met with a well developed test image. Fully toned, great!



Developer from fresh
bottle

It took over an hour to get to this point what with one thing and another. My temper mellowed as each successive photograph left the developer fully toned.


Will I use the developer again? I still have the best part of a litre left from a dodgy opened bottle that has an 'opened on date'. As long as the contents are viable I will use it again. As to re stocking it? Not sure? It is just as well I keep some of my old friends in stock.



Developer from
fresh bottle.


Test print in fresh developer..
I did email Tetenal a long time ago to find out if they had any suggestions as to why this should be the case but have had no answer, I can share with you at the point of writing there is still no answer on posting.



Printed on Kentmere RC gloss paper developed in Tetenal Eukobrom AC