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Silver Halide and Other Unrelated Tales

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Category Archives: Chemistry

Dyrham Park/Delta 100/FX21

Someone has been living in Dyrham Park since the Bronze Age! In 577 there was a battle here and the West Saxons drove the Britons back into Wales and Cornwall. The Estate is mentioned in the Doomsday book, but most of the house that stands today date from 1691, the creation of William Blathwayt. It’sContinue reading “Dyrham Park/Delta 100/FX21”

Posted byandytree10112th Mar 2026Posted in35mm, Chemistry, National TrustLeave a comment on Dyrham Park/Delta 100/FX21

Using FX21

A couple of weeks ago I mixed some FX21, it’s a Geoffrey Crawley creation and one that was produced commercially by Paterson back in the day, and known as Acuspecial. I have a vague memory of using it in those days, but not much. When I started out, I guess like most people, Paterson UniversalContinue reading “Using FX21”

Posted byandytree1019th Mar 20268th Mar 2026Posted inChemistry2 Comments on Using FX21

Making FX21

I’ve used up the last of my FX55 developer. It’s pretty straightforward to make, and as it has become my developer of choice I’ll be making more. I’m also coming to the end of my batch of D23, that’s even easier to make, and I use it “replenished” so I just keep using it, andContinue reading “Making FX21”

Posted byandytree10122nd Feb 202622nd Feb 2026Posted inChemistry1 Comment on Making FX21

E72 Paper Developer

Last time I purchased a litre of Ilford Multigrade Paper developer it had gone off and I had to return it. I don’t think it was age per-se, there was a tiny hole in the foil seal, plenty large enough for air to get in. After that I told myself I’d make my own. FinallyContinue reading “E72 Paper Developer”

Posted byandytree10121st Oct 202520th Oct 2025Posted inChemistry, DarkroomLeave a comment on E72 Paper Developer

Single Photo: Poole Harbour

I took my OM1 with the standard 50mm f1.8 Zukio lens on my usual walk around Poole. I used FP4 and developed it in FX55. It was a nice day weather wise, some good clouds in the sky, but blue sky and sunshine. It felt like one of those “last days of summer” type days.Continue reading “Single Photo: Poole Harbour”

Posted byandytree1012nd Oct 2025Posted in35mm, Cameras, Chemistry, DorsetLeave a comment on Single Photo: Poole Harbour

More Mono

A while back I cut a film out of the camera to develop quickly. It’s not something I do often, and to be honest, at this point I can’t remember what or why! However this left a 10 or so exposure for later use or for a test. Like many, the local Lloyds Bank closedContinue reading “More Mono”

Posted byandytree1015th Aug 20253rd Aug 2025Posted in35mm, ChemistryLeave a comment on More Mono

Crawley’s FX6a Monobath

All of the, give or take, 50 years I’ve been messing about in darkrooms, the number one rule has always been, don’t contaminate (mix) the chemicals! I was surprised to discover then that monobath developers have been about since 1800 and something! So what is a monobath? Does it work and if so, how? PutContinue reading “Crawley’s FX6a Monobath”

Posted byandytree10130th Jul 202527th Jul 2025Posted inChemistry4 Comments on Crawley’s FX6a Monobath

SS Great Britain and HP5

I had a full day in the city of Bristol this weekend, it didn’t go quite as planned and so I ended up, rather unexpectedly visiting the SS Great Britain, designed by the great Isambard Kingdom Brunel. This wasn’t a bad thing as I’ve fancied seeing it for ages. Amazingly after over 100 years onContinue reading “SS Great Britain and HP5”

Posted byandytree10123rd Apr 202522nd Apr 2025Posted in35mm, Chemistry, TravelLeave a comment on SS Great Britain and HP5

Ilford Perceptol from D23

I made up some new D23 developer last week. All formulars are for 1 litre and to calculate less is a pain and not worth the effort. 750ml is used, then 250ml of the old stock is added to make up to the litre, this is so that all the “goodies” that have built fromContinue reading “Ilford Perceptol from D23”

Posted byandytree10121st Apr 2025Posted in35mm, ChemistryLeave a comment on Ilford Perceptol from D23

Mixing things up!

Last Thursday I developed a film with the last of my FX55. A home made Vitamin-C developer formulated by Geoffrey Crawley. I was introduced to it, and shown how to make it by John Finch over at Pictorial Planet. I’ve found it to be a great developer, fine grain, good contrast, easy to use, andContinue reading “Mixing things up!”

Posted byandytree10113th Apr 202513th Apr 2025Posted inChemistryLeave a comment on Mixing things up!

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