Clean and Clear PaRodinal

[titrisol]

Thanks Gerald, I stand corrected.
I thought that having some p-aminophenol base helped with keeping the activity even though it looks like pepsi

[karavelov]

Could we make a step further and react it with chloroacetic acid in order to obtain photo-glycin (N-(p-hydroxyphenil) aminoacetic acid) ?

Just curious
luben

[marcsv]

I read somewhere that we can convert the excess of NaOH to Borax by the addition of Boric acid. What is the implication of the presence of borax in this brew?

[Blighty]

Dear all,
Really intrigued by this formula, so I made some up today following Donald Quall's post: 6 Paracetmol tabs 500mg, 4g Sodium hydroxide and 10g sodium sulphite in 50ml of water. I haven't tried it yet, but at the moment it doesn't look to have changed colour and indeed looks very cloudy, thick and colourless. Is this usual?

[titrisol]

YOu actually have to wait 3 or 4 days before it is ready to be used.
The change from acetaminphen to p-aminophenol is quite slow at room temperature I believe

[gainer]

There may also be some inert but insoluble filler in the tablets that may cloud the solution.

[marcsv]

There may also be some inert but insoluble filler in the tablets that may cloud the solution.

That is usually the case when you use acetaminophen tablets instead of the powdered form.

blighty,
I usually give the brew 48 hourss for the conversion of acetaminophen to p-aminophenol. the precipitate will not harm the film emulsion when you dilute the solution (to my experience that is)

[Blighty]

Well, I processed a roll of HP5 for 11 mins 1+50 yesterday. It works! The negs didn't come out I as I expected (to be honest, I wasn't sure what to expect). The negs looked a bit thin, but closer inspection showed pretty good shadow detail with admirably restrained (if a little anaemic) highlights, a consequence I suppose of the !+50 dilution. Not sure if I'll use it again, but it's nice to know if the photographic chemistry industry goes tits up then I've got a readily available alternative.

[hjesus]

Yes, you are absolutely right, I think. I intended to do the same, now I am sure it will work. What kind of paracetamol did you use? Tablets? And what about the other stuff contained in the tablets?

[fotch]

Hello hjesus and welcome to APUG. You probably already know this is an old thread so you may need to start a new one. Just a thought.