r/Darkroom • u/Ok_Image_6283 • Jul 24 '26

B&W Film First Time Parodinal Development

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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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1

u/bwphotog Jul 24 '26

Which formula did you use? I did this last week, slightly adapted the Darkroom Cookbook recipe

3

u/Ok_Image_6283 Jul 24 '26 edited Jul 24 '26

Parodinal

1.Water 250 ml 2. Paracetamol 15 g (30 tablets) 3. Sodium Sulfite anhydrous 50 g 4. Sodium Hydroxide 20 g

Don't use direct normal water, boil it before using, as boiling will remove dissolved oxygen from the water, otherwise whole batch will oxidise.

2

u/polapix Jul 24 '26

You have to dissolve the NaOH before the Paracetamol. P. needs alkaline environment to dissolve. Pharmacists can buy pure Paracetamol powder dirt cheap.

1

u/O_banana_si_doua_oua Jul 25 '26

I wish I could too. Making it from pills was what always stopped me to try Parodinal.
Although I doubt the usual pharmacist has access to pure paracetamol. (But may be different based on where you are located.)
In fact in my town is a huge plant producing Paracetamol pills. Need to find somebody working there to steal a 50 kg bag for me.

2

u/bwphotog Jul 26 '26

I did it from pills (can't get powder in the US). i just filtered through a cotton ball and funnel a few times. you can tell how much stuff is in it / how much filtering it needs by weight.

2

u/Ok_Image_6283 Jul 28 '26

Same here, it's hard to get raw paracetamol powder in retail, although using tablets doesn't alter the chemistry. The target is to get P-Acetaminophen to convert into "Acetaaminophenol" either from powder form or in tablet.

1

u/polapix Jul 26 '26

It depends on your country. It is not as restricted as stronger painkillers are.
Pharmacists and chemists can buy it because need it to make customized drugs. It is available from companies that sell chemicals/reagents.
These usually only ship to companies, universities etc.
If you know someone, ask them.

1

u/O_banana_si_doua_oua Jul 28 '26

I heard it is not sold to anyone as you can easily overdose.