This has no resemblance to the Tetenal product. It is exactly the same Kodak product used in large roller-transport units. I use it in my drums of all sizes (including 30x40), or I could use it in any automated roller machine. For the latter usage, they recommend a stabilizer. I dev at 30C for 2min.
It works wonderfully and reliably. I never had luck with that Tetenal "room temp" nonsense.
Well, thanks a lot to you all for your help.
After querying the product vendor (ag photographic), and after tests made this night, I can say that this kodak RA4 RT/LU 4x5l works well in a rotary jobo processor, without starter.
For information, if someone is willing to split the mix, here are the quantities of concentrates for this kit (in europe, at least) :
Concentrates to make 5L :
A = 250ml
B = 120ml
C = 250ml
A = 700ml
B = 1000ml
(this matches the DREW WILEY's indications)
The starter is used to keep the color balance equal in large tanks where replenishment is a must. On a rotary unit where the chemicals are discarded after each use that doesn't matter. I use this exact kit in an ATL and in a nova vertical processor without starter and it works just fine. Replenishment rates on the nova are per processor quantities without starter; no problems so far. Solutions last at least two months there.
That doesn't agree with my own findings made today (15/12/2013)...
Originally Posted by clasbou
I have a Kodak RT/LU 4*5L kit bought from AG Photographic some time ago (around 2010).
The instructions on the dev bottles (A,B,C) state:-
"3.5L water + a + b + c + water to make 5L".
I wanted to initially only mix half to give 2.5L (my 12x16 Nova tank capacity is 2L per slot).
As the bottles do not indicate the quantity of each concentrate, I decided to measure the content of each using a measuring cylinder.
For the total concentrates to make 5L, I measured...
A = 400ml
B = 230ml
C = 400ml
A = 720ml
B = 1025ml
Has Kodak changed the concentration?
Here's something else I discovered...
For 1L Dev Replenisher, the measurements for my kit indicate I would need :-
A = 80ml
B = 46ml
C = 80ml.
Water = 794ml.
That doesn't agree with the figures published by Kodak (PDF dated 2009):-
Kodak's figures for Dev Replenisher RT indicate :-
A = 50ml
B = 22.2ml
C = 50ml
Water = 877.8ml
Dev A gives a ratio 50/80 = 0.625 for the difference.
This is exactly the same ratio as the difference of the amount to make 5L (=250/400) which again suggests the concentration in the kit has changed.
For Dev B, we get = 22.2/46 = 0.48
For 5L, 120/230 = 0.52
A Similar ratio, although this time not exact.
I'm now trying to figure out how much starter I need.
I have a 1.2L bottle of Kodak Ektacolor RA.
For RA-4, the instructions on the bottle give:-
700ml Replenisher + 25ml Starter + 275ml water = 1L.
Kodak's PDF for 1L gives:-
A = 40ml
B = 17.8ml
C = 40ml
Starter = 24ml
Water = 878.2ml
Alternatively for 1.25L:-
Mixed Replenisher = 1000ml
Starter = 31ml
Water = 219ml
That doesn't tie up with the instructions on the Starter bottle.
Has the starter concentration changed also?
What do I use? :confused:
My brain is starting to hurt. :(
This kit is no longer available. Just curious if you have determined whether the regular Arista RA-4 2/4 literkits are identical or not.
Originally Posted by DREW WILEY
On re-reading the Kodak PDF again, I now realise the figures I quoted are for RA Developer Additive, rather than RA Developer Starter. Doh!
Originally Posted by brian_mk
Kodak's figures for 1L "Developer Replenisher RT" are:-
Mixed Replenisher = 800ml
Starter = 25ml
Water = 175ml
They have a separate set of figures for 1L "Developer Replenisher" (without the 'RT')
Mixed Replenisher = 700ml
Starter = 25ml
Water = 275ml
The first set of figure matches the instructions on the starter bottle for "PRO RT/PRIME LU".
The second set of figure matches the instructions on the starter bottle for "RA-4".
The question is - Which do I use for my Nova Tank? :confused:
I am not familiar with the RT/LU and don't see it in the PDF. I think the RT figures in the PDF are for the RA/RT replenisher, that's why the difference. For your developer I would go by the label and your measurements and calculations. Don't know about the starter.
I decided to rely on my measurements as far as mixing the replenisher is concerned.
Originally Posted by RPC
However, when it comes to adding the starter, the label on the starter bottle is somewhat confusing:-
Replenisher Starter Water
PRIME SP 500ml 40ml 460ml
PRIME SP LORR 500ml 45ml 455ml
PRIME/PRO 700ml 30ml 270ml
PRO RT/PRIME RT 800ml 25ml 175ml
RA 161 700ml 30ml 270ml
RA-4 700ml 25ml 275ml
I don't understand the meaning of the labels on the left column.
I assume they refer to various professional minilab/processor systems?
Can someone enlighten me?
Should I use the "RA-4" quantities given in the last row for a Nova tank?
Adding 275ml of water to 700ml replenisher seems like a lot of dilution.
I have just found a couple of other APUG forum postings relating to the ektacolor dev replenisher concentrate bottle sizes in the 4*5L kits. It looks like, as I suspected, the concentrations were indeed changed at some point.
I thought I would add the references here in case anyone else finds them useful in the future...
I've spent ages trying to work out what all of Kodak's acronyms mean!
I don't know how much of this will be useful to you, but here's what I "think" things mean!
LORR= LOw Replenishment Rate (good for high throughput, lower replenishment rate reduces chemical effluent)
RT/LU = Roller Transport/Low Utilisation (good for low throughput - apparently less susceptible to oxidation)
SP = Single Part
Also, I bought one of the Kodak's RA-4 dev kits from Ag-photographic in 2009. It remained in storage from early 2010 while I moved house and rebuilt my DR. The kit was oxidised when I took it back out of storage. I bought a new kit from Ag at the start of this year and both the concentrate bottle sizes and the smell of the developer are different. I don't know if this is because Ag have changed the version that they offer, or whether Kodak have changed the formulation. Point is, it's possible that older product numbers (and therefore potentially different formulations) are still kicking around.