The purple stains on the once-gold ceilings in Spain's Alhambra palace are due to the oxidation of silver in the paint.

The purple stains on the once-gold ceilings in Spain's Alhambra palace are due to the oxidation of silver in the paint.

The Alhambra, built in the 14th century, is a world-renowned tourist destination. But its beauty has been diminished by the purple stains on its ceilings and other structures. The cause of the stains has been a mystery for centuries. But scientists say they have now solved the mystery.

Analyzing the gilding on the 15th-century painting “Virgin and Child with Saints and Angels,” researchers found that as the gilding decayed, it formed gold spheres that are responsible for the purple color. The findings, published in Science Adv

The Alhambra is a palace and fortress complex located in Granada, Andalusia, Spain. It was originally built as a small fortress in 889 AD by Moorish ruler Muhammad ibn Nasr. Over the centuries, it was expanded into

Geologist Carolina Cardell first noticed purple stains on the gypsum in 1993, but she and her colleagues didn’t have the tools to understand the splotches back then. Things changed when the university obtained two types of electron microscopes. The microscopes couple to other instruments that reveal a sample’s chemical elements and

Carmen Navarrete, a colleague of Cardell's and former head of restoration at the Alhambra, sadly passed away before the team could get answers. Cardell, along with electron microscopy expert Isabel Guerra of the University of Granada, decided to carry on with the work in dedication to Navarrete. They examined layers

The discovery of gold nanospheres in microscope images of gypsum proves to be a fascinating one. These nanoparticles are incredibly small, measuring in at just 70 nanometers wide. What's even more fascinating is that the size of these nanospheres directly

A new study has revealed that the famed ‘Alhambra’ palace in Spain is slowly being corroded by sea spray. The Alhambra is a UNESCO World Heritage site and one of the most popular tourist destinations in Spain. It is renowned for its beautiful Moorish architecture and intricate gold-leaf gilding. However, a new study published in the journal Science Advances has found that the gold-leaf gilding is slowly being

The spheres were likely formed by a series of chemical reactions that were triggered by the exposure of different parts of the gold to different oxygen concentrations. This led to the dissolution of some of the gold, which paved the way for the formation of the

The study provides a detailed look at the surprising colors of the Shroud of Turin, and how they were created. The colors are created by a chemical reaction between the iron in the cloth and the oxygen in the air, and the colors can vary depending on the

There have been a few reports of purple gold on damaged artwork and architecture. Cardell believes that the white gypsum coating added to the Alhambra in the 19th century made the purple easy to notice. "We think that this purple color is more

Related news
A clever molecular trick that extends the lives of these ant queens has been discovered.
A clever molecular trick that extends the lives of these ant queens has been discovered.
For some ant queens, the secret to long life might be a self-produced insulin blocker
A video has surfaced of what appears to be the first fox known to fish for food.
A video has surfaced of what appears to be the first fox known to fish for food.
Inches from his paws, frenzied, spawning carp writhed in the shallow water along a reservoir’s shore
Oort cloud comets may be spinning themselves to death.
Oort cloud comets may be spinning themselves to death.
Comets from the solar system’s deep freezer often don’t survive their first encounter with the sun
Neutrinos are ghostly particles that could explain the universe's matter mystery.
Neutrinos are ghostly particles that could explain the universe's matter mystery.
The answer to one of the greatest mysteries of the universe may come down to one of the smallest, and spookiest, particles
As early as 8 million years ago, fossil finds have put gibbons in Asia.
As early as 8 million years ago, fossil finds have put gibbons in Asia.
Small-bodied, long-armed apes called gibbons swing rapidly through the trees, far outpacing scientists’ attempts to decipher these creatures’ evolutionary story