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FX-55 Crawley’s Ascorbic Developer
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27 May 2022
An unusual but excellent vitamin C developer!
Part A of the developer is the usual liquid stock solution but contains no developing agents and should last pretty well indefinitely, at least for a few years.
Part B is made of the developing agents sodium ascorbate and phenidone in dry form.
Once the working solution has been made, Crawley says it keeps for about 36 hours.
Before use, dilute some the below Part A 1+9 with water to make 1 Ltr of working solution. Then add and dissolve the dry chemicals of Part B below to the 1 Ltr of working solution.
I happily make 500ml working developer by diluting 50ml Part A and make up to 500ml with water. Then adding 0.7g sodium ascorbate powder (my scale doesn't measure more accurately than 0.1g) and 5ml of a 1% phenidone solution (in propylene glycol). I use a syringe to measure the 5ml which is very accurate.
FX-55 is an excellent developer with a broad tonal range. It is sharp and fine grained with none of the mushiness of high sulphite developers like D76. It's also a lot safer when you want to keep away from metol, hydroquinone and pyro.
FX-55 Part A StockThis is a long lasting concentrated stock. It is to be diluted 1+9 with water to make a working solution (a 10% working solution from stock). To this working solution we add the dry chemicals below.
|Sodium sulphite Anhyd.
|Water to make
FX-55 Part BTo be added and dissolved just before use to the 1 Ltr of 10% working solution of Part A above.
Acros at 80ISO developed in FX-55 6 mins 24degC - very slightly over developed. Use 5:30 as below. Nevertheless, the clouds have been rendered very faithfully showing an element of developer compensation.
The grain from the picture above. This is a tiny section just above the tall tree. You can see the stunning detail that this combination has captured, the micro-contrast is excellent.
FX-55 with Ilford IR film SFX