Field's Chromatography or Treatise on Colours and Pigments as Used by Artists — Background and Themes

A Voice of Practical Judgment

The narrative voice is that of a seasoned chemist-artist, not a theorist. Salter consistently evaluates pigments by their behaviour on the palette: 'its costliness, lack of brightness, and tendency to redden, are against its employment.' Such verdicts recur throughout, creating a rhythm of description followed by dismissal or cautious approval. The language is precise but not dry; it carries the authority of someone who has mixed these colours. When discussing Iodine Blue, he notes it is 'exceedingly fugitive, even the carbonic acid of the air separating iodine from it'—a vivid warning that doubles as a chemical lesson. This voice never wavers into pure enthusiasm; even promising discoveries like Pittacal are described with measured interest, noting it 'closely resembles indigo' but that its mode of separation 'has not been clearly described.'

Shifts in Pace: From History to Laboratory

The treatise alternates between two distinct paces: expansive historical narratives and terse chemical reports. The opening chapter lingers on ancient colouring, with sentences that unfold slowly: 'How early, and to what extent, colouring may have attained the rank of science among the ancients, are questions not easily set at rest.' Later, in the pigment-by-pigment chapters, the pace quickens. Entries on rare colours—Iridium Blue, Manganese Blue, Platinum Blue—are often just a paragraph or two, each ending with a curt dismissal. The section on Wood-Tar Blue, however, slows again to explain the derivation of Pittacal, complete with etymology and a note on its use as a test for acids. These tempo changes mirror the book's dual purpose: to educate the artist in both the history and the chemistry of colour.

Recurring Details: The Language of Instability

A persistent motif in the excerpts is the language of instability. Colours are described as 'fugitive,' 'liable to suffer,' 'injured by impure air,' or 'decomposed spontaneously.' This vocabulary reflects the central anxiety of the practising painter: that a beautiful hue may fade or change. Salter's phrasing often personifies pigments, as when Iodine Blue 'decomposes spontaneously under water, yielding iodine and a beautiful blue powder.' The word 'beautiful' appears only to be undercut by 'fugitive.' Even the more stable pigments are framed by what they resist—'remains unaltered in the air at ordinary temperatures'—implying that alteration is the norm. This lexical pattern reinforces the book's practical ethos: colour is a material to be mastered, not merely admired.

Readers approaching this edition should attend to the interplay between Salter's editorial additions and Field's original framework. The 'Notice' lists consulted works, from Ruskin to chemical journals, hinting at the breadth of synthesis. The book rewards those who read not only for pigment recipes but for the implicit philosophy: that colour is both a science of permanence and an art of perception. The index and addendum offer entry points for targeted study, but the true value lies in the cumulative effect of Salter's judgments—a guide to seeing pigments as living, unstable materials.