The Arch of Titus in color

TECHNOLOGY WATCH:

Technology Identifies Lost Color at Roman Forum

By ELISABETTA POVOLEDO (NYT)
Published: June 24, 2012

ROME — Historical sources describe the menorah looted by the Romans when they destroyed the Second Temple in Jerusalem in A.D. 70 as made of gold, as God instructed Moses in Exodus.

So the recent discovery that a version of the menorah in a bas-relief on the first-century Arch of Titus in the Roman Forum was originally painted a rich yellow should not come as much of a surprise. But given that the image faded to the color of its underlying stone long ago — like so much else in and around the Forum — precise knowledge of its once-bright pigmentation comes as an exciting revelation to historians and archaeologists.

“The Bible said it was gold, but the monument, as it was seen for centuries, told us it was white,” said Steven Fine, the director of the Arch of Titus Digital Restoration Project and a professor of Jewish history at Yeshiva University in New York, which is sponsoring the project. “Isn’t it cool to be that much closer to the viewers of the first and second century?”

The findings were made possible using noninvasive spectrometry readings carried out on the arch this month.

[...]

The latest generation of ultraviolet-visual absorption spectrometers are more manageable and more sensitive, “so we can get a reading analyzing a grain of pigment on a square centimeter, and that is very helpful,” said Heinrich Piening, a conservator with the State of Bavaria Department for the Conservation of Castles, Gardens and Lakes in Germany.

Mr. Piening did spectrometric readings on the arch and compared them with a database of pigments and dyes to identify the original color. The menorah, he said, was painted a particular yellow ocher “that would have looked like gold from far away.”

[...]

I keep saying it: non-invasive and non-destructive technologies are the way of the future. Relevant posts here, here, here, here and here and links.