A Chemical Kit for Preparing Cyanotype
This cyanotype kit by Quimics Dalmau includes the two chemicals required to prepare the photosensitive emulsion used in the cyanotype process.
It is designed for those who prefer to approach the technique from a more laboratory-based perspective, preparing the solutions manually and controlling the proportions of each component.
Cyanotype is one of the most well-known historical photographic processes within alternative photography. It consists of applying a photosensitive emulsion onto a surface —usually paper or textile— and exposing it to sunlight or ultraviolet light. After washing with water, the characteristic blue image appears while unexposed areas fade away. Adding a few drops of hydrogen peroxide can enhance the contrast, producing a deep Prussian blue.
What the Dalmau Cyanotype Kit Includes
The kit contains the two chemicals needed to prepare the working solutions:
Potassium ferricyanide — 100 g
Component used to prepare solution B
Ferric ammonium citrate — 50 g
Component used to prepare solution A
Both products are supplied in laboratory format and must be dissolved in water.
They can also be purchased separately.
How to Prepare the Emulsion
The process involves preparing two separate solutions which are then mixed in equal parts before application.
A common working formula is:
Solution A
25 g ferric ammonium citrate in 100 ml distilled water
Solution B
15 g potassium ferricyanide in 100 ml distilled water
Once prepared, both solutions are mixed in equal parts just before use.
There are many variations of this formula, and part of the interest of working with laboratory chemicals is the ability to experiment.
Approximate Yield
With the included quantities, different volumes can be prepared depending on the formula.
A common ratio produces approximately 400 ml of cyanotype emulsion, although this may vary.
The number of prints depends on the size of the surface and the amount applied.
Suitable Surfaces
The emulsion can be applied to:
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Watercolour paper
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Printmaking paper
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Cardboard
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Natural textiles
Highly absorbent papers may produce softer, lower-contrast images. Sized papers or pre-treatment may be recommended.
Blue Intensity in Cyanotype
During washing, the image initially appears lighter and gradually darkens through oxidation.
Adding a small amount of hydrogen peroxide can accelerate this process and intensify the blue tone.
A More Laboratory-Oriented Format
Unlike pre-measured kits, this format allows a more experimental approach.
It is especially suitable for:
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Artists experimenting with formulas
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Alternative photography workshops
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Users familiar with chemical processes
Frequently Asked Questions
What chemicals are included?
Ferric ammonium citrate (50 g) and potassium ferricyanide (100 g)
Do I need to weigh them?
Yes. This format requires manual preparation.
How much emulsion can be prepared?
Approximately 400 ml depending on the formula.
What surfaces can be used?
Paper, textiles, cardboard and other absorbent materials.
Can the chemicals be purchased separately?
Yes, both components are available individually.
Other Cyanotype Kits and Products
If you prefer pre-measured kits, you may also consider:
We also offer refill chemicals and other alternative photographic processes such as Van Dyke and Lumen.
