In the UK, have found unknown sketches by Michelangelo
 

Employees of the British Museum discovered sketches by Michelangelo for the statue of the Madonna and Child in Bruges, reports The Daily Telegraph.
The outline was found on the canvas under the more recent figure - in the infrared range revealed traces of carbon contained in charcoal and black chalk, which Michelangelo used to work. Such technology, according to scientists, to the sketches used for the first time - before it was used only for the study of colorful paintings.

After examining the sketch, the researchers found that the model for the Madonna, probably the man. They note that this discovery was not a surprise for them, because at the time of Michelangelo's women were used as models are rare.

In total, with the help of new technology, researchers found for 8 unknown sketches by various authors (in particular the outline of Andrea Mantegna). Researchers note that in the beginning of XVI century, the paper cost is expensive, so artists used the same sheet several times. As an eraser used stale bread.

Paper cost is really expensive.

But this is not the reason.

Facilities cost is cheaper.

It could be charcoal abundance.

And coal is erased simple cloth.

And not necessarily crumbs.