The testing of a masterpiece is a very delicate operation, for if it is done carelessly, it can destroy something both priceless and irreplaceable. The restorers at the Prado were experts. Most of them were unsuccessful painters who had taken up restoration work so they could remain close to their beloved art. They started as apprentices, studying under master restorers, and worked for years before they became assistants and were allowed to handle masterpieces, always under the supervision of senior craftsmen.
Juan Delgado, the man in charge of art restoration at the Prado, placed the Puerto on a special wooden rack, as Christian Machada watched.
"I want you to test the signature," the director informed him.
Delgado kept his surprise to himself. "Sí, Senor Director."
He poured isopropyl alcohol onto a small cotton ball and set it on the table next to the painting. On a second cotton ball he poured petroleum distillate, the neutralizing agent.
"I am ready, señor."
"Go ahead then. But be careful!"
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