The Colour Index is a working reference, but it is also a historical record. The Heritage archive preserves retired and superseded Generic Names, narrative notes from the print editions, and the alternative numbering schemes that predate the Constitution Number.
What the archive contains
Retired Generic Names — colourants no longer in commercial production — remain searchable under their original CICN. Each retired entry carries the date of retirement, the reason (commercial withdrawal, regulatory ban, chemical reclassification), and a pointer to the modern equivalent where one exists. Narrative editorial notes from the 1924, 1956, and 1971 print editions are preserved verbatim alongside the modernised entry.
Why it matters
Conservators studying a Victorian dyed textile, a Renaissance manuscript pigment, or a twentieth-century advertising poster need to resolve the historical name to a modern chemistry to plan a conservation intervention. The Heritage archive is the bridge between the literature of the period and the working database of today.
The Historical Committee
The archive is curated by the SDC’s Historical Committee, in partnership with conservation programmes at the British Museum, the V&A, the Smithsonian, and several university conservation departments. The committee meets twice a year; meeting minutes and current archival projects are listed in the Heritage section.
Submitting a historical record
If you have unpublished material on a historical colourant — a sample, a recipe, an archival reference — the Historical Committee welcomes submissions. Contact historical@colour-index.com with a short description and we will route the submission to the relevant curator.