Acid free:Papers and mounting boards have to satisfy two conditions: a)they must be totally wood free b)and be buffered with calcium carbonate (neutral PH) as protection against acid elements of the atmosphere.
Neutral Ph:Papers and mounting boards are buffered with calcium carbonate. This is one of the two conditions to have an acid free product. Then a neutral PH cardboard is not acid free. In particular pulp wood mount boards, which form inside core of the standard quality, are not acid free.
Silk papers: natural papers producted in paper mill without any intervention to scar surfaces.
Branded/woven papers: papers on which a woven brander felt, during paper’s forming (when water content is over 50%), has left a woven print on the damp paper’s side. Engraving is shallow and weave’s borders aren’t perfect defined.
Ruled papers: woven papers with particular horizontal drawn lines, storically this is defined lineation.
Cloud papers: they are realized altering paper’s forming (technically: sferatuta), so cellulose’s flakes arrange inside the paper in a heterogeneous way.
Embossed papers: through a second working out machine, silk papers become embossed. The paper pass in a embosser between two calendars, whose one, in special steel, bears a draw, in negative, which will leave on the paper.
Glossy papers: born like silk paper, they are working again out machine. On the side a mixture (patina), compounded by binders, mineral charges, colours and particular additives is laid. In this way the paper’s side is endowed of a particular aspect or effect, technical or aesthetic. In the Modern Art’s case the aesthetic aim is to give a metallic aspect.
Carte a mano/Hand made paper: these papers are born from cotton fibres; flakes, reduced to pulp, are immersed in a tank in which glue (neutral PH) and natural colours are added. Paper making is made sheet by sheet. A wood loom, operated by two men, is immersed in the tank and raised, what remained in surface will became a paper sheet. Each sheet is laid, protected up and down by two thin layers which separate it from next sheet, laid upon it: process is repeated at various time as far as forming a pile. Then the pile is pressed to remove excess water. Finally the sheets are hung out to dry in the sun and air.
Marble paper: Sheets are immersed one by one in a tank in which wished colours sail (gold, silver, copper, etc…), in this way colours settle on the surface by chance, “blotting” them. Finally sheets are hung out to dry in the sun. It’s impossible to produce identical sheets through this process.
Cellulose thin layers: Acid free cardboards of varying weight and thickness. They are unit of measure for multiple combinations and consequent obtainment of high-highest acid free thicknesses. Upper and lower paper and cover aren’t necessary, unless customer desires different colours from those of thin layers (which are always snow-white, white, ivory). It is possible to obtain double face for cardboards in layers, changing last layer’s shade; bevel’s colour is that of the larger layers.
Double face: It is named double face a passpartout mount board in which two side are usable as front. Sides have probably two different colours, but it is possible to have the same colours for the two side.