Book publication
February 2023
staining developer
high resolution
maximum sharpness
fine grain

Suitable for tank and dish development
It is also possible to use this developer in a rotation tank. However, in direct comparison the sharpness is significantly lower. If you want to use a developing machine, we recommend the TAS film processor by Heiland Electronic.

You do not need to rinse before developing the film. The only exception is Delta 400. After a couple of minutes of developing this film you get a lot of foam in the tank. If the tank is only filled to just about cover the film, this can lead to errors in development. You can overcome this problem by rinsing the film for 2 to 3 minutes before you develop.

Dilute developer and alkali with water in a ratio of 1+1+100. Do this immediately before you start developing. In such high dilutions the water quality can have consequences for the film speed. Therefore we recommend the use of distilled water. In tap water the film speed can be 1°DIN higher as well as lower than shown in the development table.

Unlike the familiar staining developers on the basis of pyrogallol, auto-oxidisation of Tanol starts a lot later. This is an advantage when developing N+ based on the zone system. During long development times you don’t need to worry about early exhaustion.
As with pyrogallol a dye builds up proportionally to the silver density. The ‘Tanol stain’ is less obvious to see than the ‘pyro stain’ but just as effective. The dye accumulates between the grains of silver and lessens the impression of graininess that necessarily occurs with all sharpness developers.
When using graded paper the stain has little influence on the highlight contrast as long as you stick with the recommended times. On VC paper the stain acts as an additional soft filter in the higher densities.
This developer is especially interesting for large format negatives. The results will be suitable for conventional development as well as alternative development techniques such as platinotype and cyanotype. When using contact printing techniques of the early days of photography, you need negatives with dense highlights and a straight lined density curve. The contrast range should be between 1.7 and 2.0 logD. When printing, expose with daylight or UV light. Since the stain blocks UV light, you can print straight from the original negative.

The stock solutions have a shelf life of 6-12 months 
Included in delivery of Tanol:
2x100ml for the preparation of 10 litres of working solution – capacity 40 films
a brown glass bottle with a graduated pipette and pipette rack
or a refill plastic bottle with an injection device in the lid
2x250ml for the preparation of 25 litres of working solution – capacity 90 films; with a refill plastic bottle with an injection device in the lid
2x500ml for the preparation of 50 litres of working solution – capacity 200 films; with a refill plastic bottle with an injection device in the lid

image examples of silver prints

image examples of alternative printing techniques


Take a look at our calculator for developing times.

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Wolfgang Moersch Photochemie
Am Heideberg 48
50354 Hürth

Tel.: +49-2233-943137
Fax.: +49-2233-943138


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