Prior to the mid-20th century, art restorers took a heavy-handed approach, often drastically altering paintings in the name of "improving" art. Today, they focus on keeping the original work intact with minimal intervention, and must regularly contend with past modifications. So, how is damaged artwork repaired? Noah Charney explains the painstaking process of restoring priceless artifacts. [Directed by Michael Kalopaidis, Zedem Media, narrated by Addison Anderson, music by Manolis Manoli].

Noah Charney: Can you guess what's wrong with these paintings? 

Can you guess what's wrong with these paintings? 

Art's history is as deep as the layers of paint it's built upon; even iconic works have secret pasts obscured by time and restoration.

Modern science unveils art's hidden stories, from Bronzino's altered identities to Rembrandt's amputated canvas, revealing truth beneath.

Restoring art's true essence: Using X-ray and solvents, conservators reveal hidden original features beneath centuries of overpainting.