Wednesday, August 1, 2012
I am confused. On the History channel last night I watched a program about Leonardo daVinci and his secret messages in his paintings
At one point they showed a painting started by another person that Leonardo completed. Leonardo added an angel to the painting, using paint different than the original painter. The program questioned why Leonardo would have used a different paint.
Leonardo used a lead based paint to paint the angel. The original painter had used some other kind of paint. When they did an X-ray of the picture that is done to see what is hidden behind the paint, Leonardo’s angel disappears.
My question, my confusion, is because I understand that lead blocks or absorbs X-rays. How does the X-ray see behind the lead paint to the scene behind the angel? Why does it disappear? Am I missing something? I would think the lead would keep the X-ray from seeing behind the angel.
Can anyone answer my question?