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For about a hundred years, between the 1st century. a. C. and the 2nd AD, flourished in the Roman world a particular pottery production, definitely the most interesting, called "Terra sigillata from Arezzo. The term terra sigillata refers to a type of ceramic tableware featuring unique powers: clay, covered with a purified and very beautiful "paint" coral.

The surface is often decorated with relief depictions of great craftsmanship and the presence of cartouches with the names of the authors, called "seal."

The center of this production was greater Arezzo, where dozens of shops released large quantities of manufactured goods.

The term "sealed earth" today is used to define a glazing ceramics painted with slips. These special coatings can be obtained by separating the clay and coarser than colloidal.

generally choose plastic clays ferrous very high in sodium and potassium.

Rainwater, sodium salt and clay are the ingredients to achieve terra sigillata:

after drying the clay to finely crumble, preferably in a transparent container dissolve approximately 5 calgon grams in one liter of water, we will introduce the clay and mixed vigorously after we let it settle for 8 hours.

In our mixture the finer particles are separated from the coarse

With a tube we're going to remove the suspended solids that will be easily visible through the transparent container, the material will get a set of elements and sodium salt of nature Potassium (fluxes), silicates and possible iron oxide.

A good ground must be sealed in shiny waxy crude.

raku The sweet is the technique where there is an obvious contamination of the Mediterranean to Japan's ceramic culture. For

this sensitive technique using mainly non-calcareous clay with a white grains of chamotte thin or absent.

stages of shaping and finishing are essential for the success of the article, in fact, ill-finished objects give rise to defects dell'ingobbio vitrification. For this reason it is recommended to round the edges and fences fine objects.

The first step of earth will be sealed to the bottom and the next steps will be the same type of clay which is fashioned the piece is necessary that the temperature of cooking shows microporous.

The next step involves the application of glazing is not sealed, and not smoked. If we want we will use a white terra sigillata pottery, or for a common yellow orange clay or earthenware baking dish. Once the decorative phase

the artifact should preferably be cooked in an electric kiln to 1000 ° C, with a second firing at about 600 ° C oven raku're going to smoke in the work, using thin damp sawdust. Parts of microporous slip immediately and blackening the surface of our object will present a blackened texture of quibbles, due to "rupture" of the thin layer of terra sigillata.