Initials from Choir Books

Selective use of egg yolk binder

Artists' Materials

Egg yolk is present in areas painted with red lead, and probably also with vermilion, in the two initials painted by Don Silvestro dei Gherarducci (see Artists).

The image of St Laurence also contains small amounts of egg yolk in orange and red areas, but the same binder was also employed in the initial and border ornament, irrespective of the pigments used. In all three cases, the spectral signature which identifies the binder is not as intense as would be expected if egg yolk had been used alone. It is possible that whole egg was used, or else that a small amount of egg yolk was added to another type of binder, perhaps to improve the handling properties of the paint.

The spectral signature is stronger in the fourth initial, where only the figure of Christ was painted with egg yolk. Egg yolk was not used in the initial and its ornamentation. This paradigm is consistent with the results of technical analyses carried out on other contemporary books from the Santa Maria degli Angeli set and on the Acciaiuoli Missal (MS 30). These are all linked to the work of the later generation of Florentine artists led by the celebrated panel painter and illuminator Lorenzo Monaco.

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1
Detail of the face and hair of Christ under magnification (7.5x).
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2
FORS spectra showing the presence of egg yolk, identified by characteristic absorption bands at 2307 and 2350 nm, in the yellow robe of Christ but not in the blue acanthus leaves.
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3
Detail of the mosaic gold leaf, outlined with a transparent organic glaze, under magnification (16x).

Christ the Redeemer

Historiated initial I from a Gradual, 1373-1382 or c.1409, with foliate ornament added later, probably c.1450

Christ holds an image of the Earth, the so-called ‘T map’ from Ptolemy’s Geography, inscribed with the three continents known at the time: Asia, Uropia, Africha. Christ’s figure forms the initial I which probably opened the Mass for Easter Monday in a Gradual. It may be the work of Don Silvestro dei Gherarducci’s collaborator, the Maestro delle Canzoni, from Santa Maria degli Angeli’s Corale 3 (dated 1409, but containing later additions). Alternatively, it may have been painted by Cenni di Francesco di Ser Cenni who was based at San Pietro Maggiore in Florence in the 1380s and contributed to a (now lost) set of Choir Books illuminated between 1373 and 1382. This image differs from the other three in materials: it contains of a purple hue obtained with an insect-based dye, umber in the darkest portions of Christ’s flesh tones (see layer ‘elemental map Mn’) and yellow ochre in the highlights in his hair (hotspot 1).

Whoever painted Christ’s figure, he was not responsible for the letter shape and the surrounding acanthus; there are stylistic as well as technical differences between the two areas. Spectral evidence for the use of a lipidic paint binder, most likely egg yolk, is found only in the figure of Christ (hotspot 2), suggesting that it was painted by an artist familiar with the egg tempera technique commonly used on panel. The initial and the surrounding leaves were supplied later, probably by Niccolò Rosselli (1407-1471), an illuminator who became a monk at Santa Maria degli Angeli in 1429, contributed to other leaves in Corale 3, and was paid for his work at the scriptorium in 1454.

The later date is supported by the fact that the mosaic gold decorations present on either side of the initial (hotspot 3) are outlined in a very different way from those painted in the 1370s and 1390s (see for example hotspot 3 for Marlay Cutting It. 13i) and even from those still present in Corale 3 and painted in the 1410s.

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