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No one can do a good job without proper tools, and the chemicals can be defined, the tools of the photographer.
This is the weak point of many operators. They work with economic and inferior chemicals, and many do not know the true composition; Not to mention unwanted interferences that can be created between them.
Without an in-depth knowledge of photographic chemistry, the operator cannot reach that level which can be truly defined as art photography.


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Gold Toning for Van Dyke brown and Kallitype prints

Viraggio all'Oro per stampe van Dyke brown e Callitipie antiche tecniche fotografiche

Gold toning for Van Dyke brown and Kallitype prints

A good formula to gold tone a Van Dyke print is the Clerc's formula.

With this recipe you can obtain a tone range that goes from dark red to neutral grey. In some case you could obtain both tones at the same time.

The formula is as follows:

Gold trichloride (so. 1%)                                 50ml

Thiourea (sol. 1%)                                          50ml

Tartaric acid                                                   0,5gr

Sodium chloride                                              20gr

Distilled water                                             1000ml

Preparation of the solution:

Add the thiourea solution to the gold trichloride solution until the precipitate dissolves.

Dissolve the tartaric acid in 600ml of distilled water. Add the gold-thiourea solution to the tartaric acid solution and stir well. At the end add the sodium chloride, bring to 1000ml and shake until the solution will turn transparent. Store in a dark bottle. This preparation won't expire before 1 year time.

To tone a 8x10” print you need about 40-50ml of toner. To minimize the necessary amount we suggest you use a tray with a perfectly flat bottom. Dispose of the toner after you use it, it won't work a second time.

Toning must be done right after the development and a quick rinse; afterwords proceed with the fixer as usual, then wash throughly for at least 30-40 minutes.

Chemical products used in this procedure are to be considered toxic and non-suitable for human or animal consumption. As a user you must be aware of the risks and take care to protect the environment. Never dispose of chemical waste in a domestic sewage or with common garbage. For a correct disposal please see your local disposal laws.


Gold Toning for Van Dyke brown and Kallitype prints, Van dyke brown print, gold toning

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