The model book is colour-blind

Claim (verbatim)

The model book is colour-blind. Pattern sheets travelled as outline drawings with colour given verbally — the Göttingen Model Book literally writes out its recipes — while copying from a finished exemplar transmits paint by eye but forces a freehand redraw. Two transmission channels, opposite bandwidths: model-book descent should show tight geometry with a loose palette, exemplar descent a tight palette with loose geometry. The variance signature identifies the channel even where no model book survives.

Prediction clause (verbatim)

Primary clause (the verdict follows it): the sign of the difference between shape fidelity and colour fidelity is positive for motif groups scholarship ties to pattern-sheet transmission (the Göttingen Model Book acanthus group) and negative for direct exemplar copies among coloured witnesses of the Utrecht Psalter recension (the Eadwine Psalter against Paris BnF lat. 8846), measured on matched motif pairs as outline correlation versus hue correlation in calibrated digitizations. Secondary clause: in the model-book arm, shape correlation exceeds colour correlation by at least 0.2.

Kill-dataset (verbatim)

Kill: the fully digitized Utrecht Psalter (Utrecht University), British Library Harley 603, the Eadwine Psalter (Trinity College Cambridge), BnF lat. 8846 on Gallica, and the digitized Göttingen Model Book with its associated decorated volumes.

Novelty / leakage triage

provisional — model-triaged, shepherd review pending

A provisional first pass authored by the model (Opus), not yet confirmed by the shepherd. It carries the same dated-search requirements as an authoritative verdict but is excluded from every headline figure and cannot underwrite a prediction until a shepherd confirms it. Provisional reading: Adjacent (closely related prior work exists).

The two transmission channels the item contrasts are documented: the Gottingen Model Book (c.1450) carries outline drawings PLUS written colour recipes ('then one shall paint it with the colours...'), transmitting geometry tightly and palette verbally, while copying a finished exemplar transmits paint by eye but forces a freehand redraw (R.W. Scheller, Exemplum: Model-Book Drawings and the Practice of Artistic Transmission). Not located: the item's variance signature -- that shape-fidelity minus colour-fidelity is positive for pattern-sheet motif groups (the Gottingen acanthus) and negative for direct exemplar copies (the Utrecht Psalter recension: Eadwine vs BnF lat. 8846), measured as outline vs hue correlation on matched motif pairs. Channels documented; the shape-vs-colour variance-sign test that identifies the channel is unrun.

• 'Model-Book Drawings and the Practice of Artistic Transmission in the Middle Ages', Arte Illuminandi (on the Gottingen Model Book's outline drawings + written colour recipes) — Verbal colour recipes with outline drawings; model-book transmission workshop to workshop.
• The digitized Utrecht Psalter (Utrecht University), the Eadwine Psalter (Trinity College Cambridge) and BnF lat. 8846 (Gallica) — The exemplar-copy arm; the kill dataset for the shape-vs-colour variance comparison against the pattern-sheet arm.

Predictions

No prediction registered yet.