If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Which wash check to use?
I want to make sure I'm washing my fiber prints adequately. What's the
difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. -- It is not our patriotic duty to send children to be butchered & slaughtered & to butcher & slaughter others every time a general or a politician gets a hardon for a war. Rather, it is our patriotic duty to demand the highest burden of proof to justify war. It is also our patriotic duty to hold treasonous, corporate whore, war criminals accountable for their actions. |
#2
|
|||
|
|||
Which wash check to use?
seog wrote: I want to make sure I'm washing my fiber prints adequately. What's the difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. I'm only familiar with HT2. P. permanganate is typically used for reducers, tray cleaners, and stain removers. Not sure then why this would be an ingredient in a washing test. Calling Richard... |
#3
|
|||
|
|||
Which wash check to use?
Tom Phillips wrote:
seog wrote: I want to make sure I'm washing my fiber prints adequately. What's the difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. I'm only familiar with HT2. P. permanganate is typically used for reducers, tray cleaners, and stain removers. Not sure then why this would be an ingredient in a washing test. There is such a test, but it is not very sensitive. You mix a solution of 1 gram of potassium permanganate and one to 2 gram of sodium carbonate in a litre of water. It is seriously violet. Allow about 5 ml of stuff to drain from a print or negative into a small graduate. Add one drop of the permanganate solution to this. Repeat the test with an equal amount of water instead of the drainings. Compare the colors of the two. If the color persists in the drainings for as long as it does in the fresh water, the washing may be considered to be complete. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 06:15:00 up 8 days, 21:42, 5 users, load average: 5.18, 5.22, 5.14 |
#4
|
|||
|
|||
Which wash check to use?
Jean-David Beyer wrote: Tom Phillips wrote: seog wrote: I want to make sure I'm washing my fiber prints adequately. What's the difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. I'm only familiar with HT2. P. permanganate is typically used for reducers, tray cleaners, and stain removers. Not sure then why this would be an ingredient in a washing test. There is such a test, but it is not very sensitive. You mix a solution of 1 gram of potassium permanganate and one to 2 gram of sodium carbonate in a litre of water. It is seriously violet. Allow about 5 ml of stuff to drain from a print or negative into a small graduate. Add one drop of the permanganate solution to this. Repeat the test with an equal amount of water instead of the drainings. Compare the colors of the two. If the color persists in the drainings for as long as it does in the fresh water, the washing may be considered to be complete. Well that explains a bunch. HT-1a is not applied to the print...thanks |
#5
|
|||
|
|||
Which wash check to use?
On Sun, 29 Jan 2006 01:10:22 -0700, Tom Phillips
wrote: seog wrote: I want to make sure I'm washing my fiber prints adequately. What's the difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. I'm only familiar with HT2. P. permanganate is typically used for reducers, tray cleaners, and stain removers. Not sure then why this would be an ingredient in a washing test. Calling Richard Kodak HT-1a Water 200ml Pot. Permangate 0.3g Sod. Hydroxide 0.6g Water to make 250ml Dilute 1cc stock solution with 124ml water. Drain print wash water into the solution. If a small amount of fixer is detected the solution will change colors to violet in about 30 seconds and then clear. Would I bother with this test ? No. I think Kodak had good reason to develop HT-2. == John - Photographer & Webmaster www.puresilver.org - www.xs750.net |
#6
|
|||
|
|||
Which wash check to use?
"seog" wrote in message news:gIXCf.994$0J3.96@trndny08... I want to make sure I'm washing my fiber prints adequately. What's the difference between HT-1a and HT-2 residual hypo test? Is one preferable? I'd rather go with HT-2 since I have silver nitrate on hand and the permanganate in HT-1 is supposed to be nasty stuff. The Residual Silver Test test for adequate fixing not washing is that correct? THNX. HT-1 and HT-1a (slightly modified) the test using Permanganate, is a very old one and is not considered adequate. This test measures the amount of hypo in the water draining off a print or film and does not give an adequate idea of the amount of hypo remaining, especially in fiber prints. It was replaced at least fifty years ago by the silver nitrate test. This is applied to the emulsion but will also work on the support side. The silver nitrate reacts with any remaining hypo to form silver sulfide, which shows up as a yellow or brown stain. Kodak used to publish a card with stain chips called the Kodak Hypo Estimator for use with this test (and also the Sodium sulfide test for residual silver halide). There is a more elaborate version of the silver nitrate test for use with a densitometer but the simple test is adequate to check for completeness of washing. Since the test leaves a permanent mark on prints, even when washing is complete, it is suggested that a test strip be processed along with the prints for the test. Here is the formula for the Silver Nitrate test. Kodak HT-2 Hypo Test Solution Water 750.0 ml Acetic Acid, 28% 125.0 ml Silver Nitrate 7.5 grams Water to make 1.0 liter To test place a drop of two in a clear area of the margin of the film or paper and allow to stand for about 3 minutes. Swab off. There should be little or no stain. Note, the untreated test spots will darken in the light so the test should be carried out in subdued light and comparision made soon after applying the drops. A liter of this solution is a lifetime supply. I recommend making up no more than 50 or 100 ml at a time. Because the Silver Nitrate will react with halides in the water its best to make it up with deionized, or at least boiled, water. There should be no precipitate when makint it up. The solution should be stored in the dark and will keep several months. -- --- Richard Knoppow Los Angeles, CA, USA |
#7
|
|||
|
|||
Which wash check to use?
seog wrote:
I want to make sure I'm washing my fiber prints adequately. Search Google from this NG but not this NG for, turner horder fixer . A post there from 1991 details a few test methods. Very interesting. From Google search for, ilford permanganate hypo . That site has a few very interesting articles. Turners' approach I think most interesting. I think it will work with paper as well as with film. Dan |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
check the reseller before you buy "digital camera or anything else online..." | Richard K Rabbat | Digital Point & Shoot Cameras | 0 | January 19th 05 07:01 AM |
NAACO Zip Fix | LR Kalajainen | In The Darkroom | 17 | October 26th 04 11:06 PM |
Sodium or Ammonium, Ilford's 5-10-5 Wash Stands. | Dan Quinn | In The Darkroom | 14 | October 18th 04 02:19 PM |
Check out this scam | DR | Digital Photography | 5 | July 8th 04 07:46 AM |
Check out my new photogrraphy website http://home.earthlink.net/~pkphotography | Paul | APS Photographic Equipment | 1 | April 17th 04 01:11 AM |