Pablo Picasso used common house paint for his artwork, according to LiveScience. Art historians had long thought that this was the case, but it wasn't until research was done at Argonne National Laboratory that they knew with certainty.
Researchers used a hard X-ray nanoprobe on one of Picasso's paintings, "The Red Armchair," as reported by LiveScience. What they found was that the paint used for his paintings was the same as Ripolin, a brand of common house paint used during the 1930s. Researchers believe that Picasso used this type of paint to achieve an effect that was different than the typical effect of oil paints.