There wasn't anything particularly rigorous about the process since x-ray film affords the ability to do continuous inspection under a safelight, but here's a rough outline. Its essentially the same as a standard BW reversal with care taken to toughen the emulsion.
- Film exposed by strobes as per incident meter reading w/ bellows correction @ 100 ISO
- Tray develop in 1+50 Rodinol for 10 minutes. Intermittent agitation. The first development should be quite dense.
- Kodak stop bath with chrome alum added to 3% (3g / 100mL) for 6 minutes. Constant initial agitation for 1 minute then intermittent agitation.
- Water wash for 2 minutes
- R-9 bleach (.95% potassium dichromate, 1.2% concentrated sulfuric acid; roughly .95g and 1.2mL per 100mL water) for 3 minutes with constant agitation.
- Wash / Clear in 9% Sodium Sulfite (Hypoclear) 2 minutes
- Turn on the lights for reversal exposure
- 2nd Development 7 minutes (to completion, by inspection)
- Wash 2 minutes
- Fix 5 minutes, non-rapid acid fixer
- Wash / Clear in fresh hypoclear 3 minutes
- Final washing 5 minutes
* Neutralize R-9 bleach with excess sodium sulfite prior to storage as waste / disposal.
All the handling and processing with small solution volumes exacerbates the opportunity for emulsion damage, but in this case it was all physical, not degradation of the emulsion via processing chemicals. A pyro developer or hardening prior to first development might toughen things up even more. R-9 bleach seems to be a requirement, as my tests with a hardened negative and permanganate based bleach at standard concentrations always led to disintegration of the emulsion.
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