Conny Waters – AncientPages.com – The composition of red and black inks in ancient Egyptian papyri from circa 100-200 AD, has been discovered by a team of researchers led by the ESRF, the European Synchrotron, Grenoble, France and the University of Copenhagen, Denmark.

The analysis shows that lead was probably used as a dryer rather than as a pigment, similar to its usage in 15th-century Europe during the development of oil painting.

Detail of a medical treatise (inv. P. Carlsberg 930) from the Tebtunis temple library with headings marked in red ink. Image credit: The Papyrus Carlsberg Collection. Credit: The Papyrus Carlsberg Collection.

During the last decade, many scientific studies have been conducted to elucidate the invention and history of ink in ancient Egypt and in the Mediterranean cultures, for instance ancient Greece and Rome.

In ancient Egypt, Egyptians used black ink for writing the main body of text, while red ink was often used to highlight headings, instructions or keywords.

The scientists used the powerful X-rays to study the red and black ink in papyri from the Tebtunis temple library, the only large-scale insтιтutional library known to have survived from ancient Egypt. The samples studied in this research project are exceptional, not only because they derive from the famous Tebtunis temple library, but also because the analysis includes as many as 12 ancient Egyptian papyrus fragments, all inscribed with red and black inks.

“By applying 21st century, state-of-the-art technology to reveal the hidden secrets of ancient ink technology, we are contributing to the unveiling the origin of writing practices,” Marine Cotte,  at the ESRF and co-corresponding author of the paper said in a press release.

“Something very striking was that we found that lead was added to the ink mixture, not as a dye, but as a dryer of the ink, so that the ink would stay on the papyrus.”

The researchers came to this conclusion because they did not find any other type of lead, like lead white or minium, which should be present if lead was used as a pigment.

A papyrus fragment from a long astrological treatise (inv. P. Carlsberg 89) from the Tebtunis temple library and the ESRF X-ray fluorescence maps showing the distribution of iron (red) and lead (blue) in the red letters that write out the ancient Egyptian word for “star”. Image credit: The Papyrus Carlsberg Collection and the ESRF. Credit: The Papyrus Carlsberg Collection and the ESRF.

Thomas Christiansen, Egyptologist from the University of Copenhagen and co-corresponding author also said that fact that “the lead was not added as a pigment but as a dryer infers that the ink had quite a complex recipe and could not be made by just anyone. The fact that the lead was not added as a pigment but as a dryer infers that the ink had quite a complex recipe and could not be made by just anyone. We hypothesize that there were workshops specialized in preparing inks.”

A surprising fact is that the ink recipe can be related to paint practices developed many centuries later during the Renaissance.

“In the XV Century, when artists rediscovered the oil painting in Europe, the challenge was to dry the oil in a reasonable amount of time.” Painters realized that some lead compounds could be used as efficient dryers,” says Marine Cotte.

The scientists found that the red color in the ink is given by the ochre. This red pigment is present as coarse particles while the lead compounds are diffused into papyrus cells, at the micrometer scale, wrapping the cell walls, and creating, at the letter scale, a coffee-ring effect around the iron particles, as if the letters were outlined.

“In these halos, lead is ᴀssociated with sulfur and phosphorus,” explained Cotte, adding that the origin of these lead sulfates and phosphates, i.e. were they initially present in ink or did they form during ink alteration, remains an open question.

If they were part of the original ink, understanding their role in the writing process is also puzzling and the motivation of on-going research.”

Paper

Written by Conny Waters – AncientPages.com Staff Writer