Sinopia

Sinopia (after the Black Sea city of Sinop ) is a reddish-brown, ocher -like natural color. It was used in traditional oil painting or sketching of frescoes and mosaics. The reddish color is due to iron oxide compounds.

As Sinopia also the operation of the order executed sketching the outlines for a fresco is called directly on the wall. By the early 16th century has been working so; later, the sketches were mostly held only on a cardboard on which the outlines then perforated and transferred with coal dust on the wall were ( Spolvero ).