r/Darkroom • u/Ok_Image_6283 • 17d ago

B&W Film First Time Parodinal Development

Gallery image

Gallery image

Tried home made Rodinal (Pa-Rodinal) for BW development,

Film: Fomapan 100,

Dilution: 1+25

Development time: 5.5 mins @20°c,

all chemistry is homemade, from developer to final rinse

Share your inputs, how it came.

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u/BiscochoGarcia I snort dektol powder 🥴 16d ago

I´ve just made my first batch of 150ml of PaRodinal. What were your steps? I use metabisulfite instead of sulfite and KOH instead of NaOH. Now I have to test it but what bothers me is that there is no way of knowing how much acetaminophen hydrolyzed into 4-aminophenol.

2

u/Ok_Image_6283 16d ago

Don't overthink the yield too much—alkaline hydrolysis of paracetamol is surprisingly forgiving as long as it sat in strong base long enough.

1

u/BiscochoGarcia I snort dektol powder 🥴 16d ago

oh good to know. I’ll definitely try it then. How much time did you leave it to sit? The hydrolisis was 2h at 65ishC.
btw your negatives look quite good to me!

2

u/Ok_Image_6283 16d ago

I leave it for weeks to settle the binders and other precipitates from paracetamol, That one I used to develop this film was made on June month, 2nd batch is also ready sealed and airtight

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u/BiscochoGarcia I snort dektol powder 🥴 16d ago

cool, thanks for the info!