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Old 4th October 2017, 06:28 AM
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Default Ilford Perceptol

I read long ago some where on the net that Perceptol can be used like this: use the stock to develop your 1st film then pour the solution back into your fresh developer bottle. For each film developed after that add 6 percent to the developing time; does this mean: 1st film Ilford's recommended development or (my personal N development), 2nd film +6 percent, 3rd film +12 percent, 4th film +18 percent and 5th film 24 percent, (one liter of stock solution will develop five 120 or five 36 exposure 135mm films)? Has anyone used Perceptol this way? Do you rate your film at full box speed when using the stock solution, 1/3rd less than box speed at 1+2, 1/2 box speed at 1+3. The Perceptol would be one shot then dis-guarded when used diluted. Would I need to use a large tank for developing one 35mm film at 1+3, 200ml developer mixed with 600mm water (one empty film reel at the bottom then the reel with film loaded then another empty reel at the top)What is the most economical way to use Perceptol? Does each film need a minimum of 200mm stock solution? Thank you for taking the time to answer my questions.
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Old 4th October 2017, 06:47 AM
Richard Gould Richard Gould is offline
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I don't know about Perceptol, but following Ilfords suggestion, with D76/idii with stock they said develop forst film at ilfords suggestion, then add 10% per film up to 90% for the 10th film, with perceptol it is suggested that 4 films per litre of stock can be developed by adding 10% to the time per film, that is develop first film for the suggested time than add 10,20,30% per film, pouring the used developer back into the bottle of stock, these times are for litre
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Old 4th October 2017, 08:41 AM
alexmuir alexmuir is online now
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I have used Perceptol, but not extensively. I used the stock solution with Ilford PanF. What I found was that the film had to be rated at a lower speed. I cannot recall what worked, but it was either 32 or 25. I'm not sure if it is the same with all films. I use the stock solutions of ID11 and Microphen by increasing development time according to Ilford instructions, and this seems to work. If you have worked out your own development time by testing, you may need to do further testing to see if the Ilford percentage increases are still valid.
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Old 4th October 2017, 12:00 PM
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Found this with some developing information inside (pg29) https://www.photomemorabilia.co.uk/I...lms_mid80s.pdf

Is there much difference between developing times for Ilford panf, fp4 and hp5 and todays Panf+,FP4+ and HP5+ ?
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Old 4th October 2017, 01:34 PM
Mike O'Pray Mike O'Pray is offline
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Reading the above it would seem that Perceptol on a "replenishment" regime will develop 4-5 films per litre using the % add-on each time. This means making a note of how many have been developed and using a calculator. OK if one has a 300ml tank then there is a small saving as that will only do 3x 135 films one shot. Clearly there is a bigger saving if it is a 120 film as most tanks need 450-500ml per 120.

On the other hand Jobo tanks only need 250ml for a 135 so the saving is nil in the replenishment v one shot as stock solution contest and it is 4 films and you avoid the % calculation and if your stock is in 250ml bottles you also avoid any possible oxidisation on pour back and storage.

As far as the minimum stock per film is concerned Ilford give 1+3 times for 135 and 120 films. Ilford presumably recognise that some 135 tanks only need 250ml so I'd assume that the min stock is a little as say 65ml per film

I wonder how much more fine grain is possible with Perceptol stock compared to 1+1 and 1+3. It would have to be appreciably finer grain to make it worth my while, given the reduction in the number of films it can develop.

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Old 4th October 2017, 04:33 PM
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Found a Perceptol cardboard box with instructions. You can mix at 1 + 3 75ml stock + 225ml water this will make 300ml of developer.
You can get 13 portions of stock developer from 1 ltr. 13 x 75ml = 975 ml 13 x 225ml water =2925ml 975ml dev. + 2925ml water = 3900ml of diluted developer @ 1 + 3
You can develop thirteen 35mm films at 1 + 3 if you use a 300ml Paterson tank

or

7 120 films at 1 + 3 in a 500ml Paterson tank plus one 35mm film in a 300ml Paterson tank with 100ml left over.

3900ml divided by 13 = 300ml

3900ml divided by 500ml = 7 with 400ml left over you could develop one 35mm film in the remainder with 100ml spare.

I have read that Perceptol diluted 1 + 3 results in slow to medium films losing 1/3 stop of speed, faster films 2/3rds of a stop.
Using diluted Perceptol at 1 + 3 will be the way I will use this developer once I have sourced the chemicals to mix it up.
Are my calculations sound ?
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Old 4th October 2017, 04:50 PM
Mike O'Pray Mike O'Pray is offline
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Quote:
Originally Posted by GoodOldNorm View Post

I have read that Perceptol diluted 1 + 3 results in slow to medium films losing 1/3 stop of speed, faster films 2/3rds of a stop.
Using diluted Perceptol at 1 + 3 will be the way I will use this developer once I have sourced the chemicals to mix it up.
Are my calculations sound ?
I think it is the other way around Norm. Perceptol stock can lose you one stop with such films. In fact it may lose you one stop with any film but the more you dilute it the more you restore the film's speed so for instance at 1+3 HP5+ is only reduced to 320 compared to perhaps 200 with stock

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Old 4th October 2017, 05:35 PM
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I would try Hp5+ asa 400 Perceptol stock 1+0 ei200 1+1 ei250 1+3 ei320

Its all those numbers and Tramodol messing my head up, I'm killing time whilst suffering from a frozen shoulder. If you mixed the 1 ltr stock with 3 liters of water you would have 4 ltrs of developer to use right away. At 125 stock + 375 water = 500ml dilute developer you could develop eight 120 films in 500ml lots from the 4 liters
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Old 4th October 2017, 05:57 PM
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I feel for you Norm, a frozen shoulder is no fun, I know as I suffered with one a couple of years ago, took quite a while to get over it, even with physio therapy, and for me it was all because I got a flat battery and needed to push my old Escort to reach the power to charge the thing, I slipped and fell awkwardly and paid for it, hope you get over it soon, as far as powder developers are concerned, I very rarely use them, I would mix 1 liter of D76/1d11 and follow the ilford directions, I had a label with the number of films I could develop in stock and tick the off till I got to the tenth film, then start again, These days I have returned to my all time favorite Rodinal
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Old 4th October 2017, 05:57 PM
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Quote:
Originally Posted by Mike O'Pray View Post
I think it is the other way around Norm. Perceptol stock can lose you one stop with such films. In fact it may lose you one stop with any film but the more you dilute it the more you restore the film's speed so for instance at 1+3 HP5+ is only reduced to 320 compared to perhaps 200 with stock

Mike
I actually read some where I think it was on Roger Hicks' site, using the undiluted stock solution slow films lose 1/3rd of a stop and faster films at least 2/3rds of a stop
Well spotted Mike thank you for highlighting my error.
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