Tag Archives: pigment

Orpiment – it glisters but isn’t gold

220px-KellsFol032vChristEnthronedOrpiment, the word derived from the Latin Auripigmentum, and also known as king’s yellow, has been known since Roman times, and was a treasured pigment used in mediæval manuscripts. Its particular value was because it was yellow and could not only replace gold when it was unavailable or too expensive, but because orpiment was similar to gold and that was the colour that was considered to be near-divine and, like God, indestructible.

 

 

 

260px-LindisfarneFol27rIncipitMattCennino Cennini in in his Libro dell’ Arte of the 15th century, describes orpiment as ‘a handsome yellow more closely resembling gold than any other colour’. It was used in books like the Book of Kells (see above) which has no gold. The Lindisfarne Gospels does have a few areas of gold, but orpiment was the colour used for yellow as in this incipit to Matthew (right).

 

 

 

 

orpiment19052a
Other yellows available at the time were not nearly as lasting as orpiment; saffron, urine and fish bile – all forms of yellow – were all far more fugitive. Orpiment could not be ground too finely, though, or it lost its egg yolk golden colour, but the advantage of this was that by being still a little crystalline, it actually glistened and reflected the light.

 

imgresIt is, though, one of those colours where it is very wise not to lick brushes. Orpiment is arsenic trisulphide, and Cennini said ‘beware of soiling your mouth with it, lest you suffer personal injury’! Wise words.

It wasn’t a colour that mixed well, though. Sulphur in the pigment reacted with copper in verdigris, and the lead in ceruse, or white lead. In the 17th century, Cornelius Jansen wrote: ‘Orpiment will ly faire on any culler, except verdigres, but no culler can ly faire on him, he kills them all’.

On the rebound – a 14th century book

Cover of choir bookMany of us don’t fully appreciate the work that has to be done behind the scenes to ensure that manuscript books in exhibitions are presented in the best possible way. In the Victoria and Albert Museum, a choir book made in Tuscany, probably Florence, in around 1380 for a religious house of nuns is one such. It contains the chants to be sung in the Masses for saints on their feast days.

 

 

 

Piccolomini LibraryThese choir books were usually large enough to be propped on a stand so that all the choristers could see the words and music at the same time. Many of them are quite huge, and there is a glorious collection of these books which can be seen by the public in the Piccolomini Library at the cathedral in Sienna, Italy.

 

Choir book before restorationThe V&A book, though, was not in a good state of repair. It had been stored upright rather than flat and this had put a strain on the binding such that the front cover and the first few quires were separated from the rest of the book. Handling the book was challenging without causing further damage.

 

Detail of damaAlso, the inside was in a sorry state. It was very dirty, and some of the pigments and gold leaf had started to detach. There is a large chunk of gold leaf that has fallen off in this illumination and the other areas of gold look damaged too.

 

 

 

 

 

Partially cleaned manuscript pageSo the decision was made to completely rebind the book and also clean and consolidate the pigments. Most of the cleaning was done by using a soft eraser, although there was some use of a chemical sponge. The results can be seen here on the right and below. The pigments were also analysed and a whole range of colours including the precious lapis lazuli (ultramarine) and Enlargement of cleaned areavermilion (cinnabar), as well as red lead (minium), lead white, (ceruse), azurite (citramarine) and organic pink (probably madder looking at the manuscript). The non-destructive tests on the ink were inconclusive, so it is not clear whether it was oak gall or carbon ink used.

 

 

Book sections sewn on to alum tawesThe book was rebound, including removing the metal bosses on the covers to enable the latter to be attached to a new spine. A series of photographs of this process is shown on the website page and it is a fascinating record of a true craft process.