nils_eidvall Posted February 9, 2016 Share Posted February 9, 2016 <p>Hello, I plan to develop some kodak 16mm plus-x reversalfilm in my Lomo-tank but I find it impossible to find me some bleach necessary for the processing.<br>Developers, fixers and wetting agents are easy to find but the bleach is really hard, were should I look?</p><p>What I plan to use is<br>D-76 for first developer<br>? for bleach<br>Re-exposure<br>D-76 for the second developer<br>Kodak rapid fixer as (you know) fixer</p><p>Should I also use the hypo clearing agent and the kodak photo flo as usual?<br>I have also heard that the D-19 is suitable for reversal B&W but I dont know why.<br>Is there something else I have missed and can any one help me please?</p> Link to comment Share on other sites More sharing options...
larrydressler Posted February 9, 2016 Share Posted February 9, 2016 <p>Impossible? Bleach for B&W has been around since the 1900s. <br> The Kodak publictaion for labs processing B/W reversal can be found here.<br /><a title="External link" href="http://www.kodak.com/US/plugins/acrobat/en/motion/support/processing/H-661.pdf" rel="nofollow external">http://www.kodak.com...ssing/H-661.pdf</a><br />Try as I may I could not find anywhere on their website that gives the current formulae for B/W Reversal Processing. The current process uses permanganate bleach. The original formula:<br /><br />Kodak R21a Bleach Bath<br /><br />Water 750ml<br />Potassium Dichromate 50g<br />Sulphuric acid (conc) 50ml<br />Water to 1 litre</p> Link to comment Share on other sites More sharing options...
ciaran_mcmenemy Posted February 10, 2016 Share Posted February 10, 2016 If you struggle to get the acid H2SO4 then look for 'battery acid'. I don't know about 16mm but for 35mm it calls for 2% strength in solution. If battery acid was, say, 25% strength and you needed 400ml of solution, then 2% of that should be pure H2SO4. That's 8ml. With the battery acid, you need ? *0.25 = 8. In this instance it's 32ml battery acid and 368ml water Link to comment Share on other sites More sharing options...
ciaran_mcmenemy Posted February 10, 2016 Share Posted February 10, 2016 Different developers have different characteristics. That one probably improves the contrast. Fix after to remove any inactive silver halides and use hypo as usual at the last step. 35mm has a clearing step to remove the bleach stain - I use sodium metabisulphite, 25g in 1L. Just don't sniff it! Link to comment Share on other sites More sharing options...
iversonwhite Posted February 10, 2016 Share Posted February 10, 2016 <p>Check out Freestyle Photo.</p> Link to comment Share on other sites More sharing options...
john_enea2 Posted February 14, 2016 Share Posted February 14, 2016 <p>for bleach, I Mix up the bleach in 2 parts, 500ml each. keep em separate until time to use. I add them together at same time. it is not real stable but can be used up to 4 times once mixed if used within a few hours of being mixed together. Part A is 500 ml water with 3g of Potassium dichromate and part 2 is the acid, 500ml water with 12.5 grams Sodium Bisulphate. I got the Sodium Bisulphate at a pool supply company as pool acid. slow agitation for 10 minutes. Your leader (when complete) should be clear. if not, you have not bleached enough.</p> <p>just an FYI, I use a chemical reversal step and its much easier than re-exposure with a light source. Peter Cater should chime in. he is the one who gave me his recipe for the process and its great. </p> Link to comment Share on other sites More sharing options...
Fotohuis RoVo Posted February 18, 2016 Share Posted February 18, 2016 <p>There is a complete reverse kit available from <em>Klaus Wehner</em> in Paderborn, Germany. This kit is without the crappy materials like Potassiumdichromate.</p> Link to comment Share on other sites More sharing options...
larrydressler Posted February 18, 2016 Share Posted February 18, 2016 <p> And not importable to the U.S.A. If I could mix these kits here I could sell them here.</p> Link to comment Share on other sites More sharing options...
Fotohuis RoVo Posted February 18, 2016 Share Posted February 18, 2016 I would say: Take contact with Klaus Wehner. The same for his ATM-W B&W film developer an Agfa Atomal / May & Baker Promicrol type copy. I will (let) make the developer and reversal kit in Ukraine in the near future. Link to comment Share on other sites More sharing options...
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