Argyrotype Photography Guide — Modern Iron-Silver Printing Explained

The argyrotype is a modern iron-silver photographic printing process invented by Dr Mike Ware in 1991 — a scientifically refined alternative to the 19th-century salt print and Van Dyke brown processes. While the principle is similar (UV light reduces an iron salt, which in turn reduces silver to form the visible image), Ware redesigned the chemistry from first principles: the argyrotype uses silver sulphamate rather than silver nitrate, combined with a ferric compound, to produce a sensitiser that is more stable, more predictable, and capable of producing a wider tonal range and a broader palette of image colours than its historical predecessors. The argyrotype produces rich, warm brown prints that are elegant, archivally stable (when properly toned), and a pleasure to make. This guide covers the invention, chemistry, preparation, printing, toning, and the distinctive charm of the argyrotype process.

Mike Ware's Scientific Approach

Dr Mike Ware, a chemist and alternative process photographer, systematically analysed the deficiencies of traditional iron-silver processes (self-masking, fogging, inconsistent sensitiser stability, and limited tonal range) and reformulated the chemistry to overcome them. The key innovation in the argyrotype is the replacement of silver nitrate with silver sulphamate — a silver salt that is more stable in solution, less prone to fogging, and produces finer-grained silver images with a wider tonal range. The sensitiser also uses a specific ferric compound (ammonium iron(III) sulphate or ferric ammonium citrate in a carefully buffered solution) to control the reduction kinetics and ensure consistent exposure behaviour across a wide range of conditions.

Process and Printing

The argyrotype is a printing-out process — the image forms directly under UV exposure, becoming visible on the paper without the need for chemical development. Coat the paper with the sensitiser using a brush or rod. Dry. Expose under UV through a contact negative. The image appears progressively during exposure. After exposure, develop briefly in water to clear the unexposed sensitiser. Tone (gold, selenium, or palladium toning is recommended for archival stability). Fix in dilute sodium thiosulphate. Wash thoroughly. The resulting print has a warm, rich brown tone with excellent shadow depth and delicate highlights — similar in appearance to a Van Dyke brown but with better tonal range, more consistent results, and improved archival potential when toned.

The Argyrotype Aesthetic

Argyrotype prints are warm, matte, and delicately tonal — the image sits within the paper fibres, giving the print a soft, intimate quality. The warm brown colour is both richer and more finely graduated than Van Dyke prints, with more detail in both highlights and shadows. When gold-toned, the colour shifts towards cooler brown or neutral grey, depending on the toning time. The prints have a handmade presence — brush marks at the coating edges, slight variations in density, and the visible texture of the paper all contribute to the craft-object quality that distinguishes alternative process prints from mechanical reproductions. The argyrotype is an excellent choice for photographers who want the warmth of silver-based alternative prints with the scientific refinement and consistency that Mike Ware's chemistry brings.