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C1S stands for Coating One Sided. Paper with this designation has a special coating on ONLY one side of the paper. This coating is generally a glossy coating on the paper. (This should not be confused with a gloss coating that is applied to sheets after they are printed)
C2S stands for Coating Two Sided. Paper with this designation has a special coating on BOTH sides of the paper. This coating is generally a glossy coating on the paper. (This should not be confused with a gloss coating that is applied to sheets after they are printed)
Uncoated paper is paperstock that has no coating. Other papers without this designation might have a sometype of coating.
Glossy paper has a special coating applied to the paper to give a glossy appears. Glossy paper is a coated paper. Coated papers keep the ink on the surface and avoids bleeding (not to be confused with an artwork bleed)
Dull paper is specially made to have a dull finish. A Dull coating is applied to the paper. This makes most printing appear crisper. This is especially good for printing books and artwork with lots of text. Dull paper is a coated paper stock.
Matte paper is non-glossy. Ink asorbs more into the paper, which reduces glare, offers great writeability, maximizes readability, which gives you the look and feel of an uncoated sheet, with the quality of a coated sheet.
Cover stock (also called card stock) is thicker and more durable than normal writing papers. Cover stock is often used to print the outside cover of a brochure. Other common applications are: rack cards, hang tags, business cards, postcards, bookmarks, calendars.
10pt or 10 point paper is noting a thickness of paper. The ’10’ is the thickness of the paper measured in thousandths of an inch: 0.010. When paper is referred to in points it is almost always referring to a cover stock. Ie 10pt gloss cover.