| Rag Paper |
| Papers with a complete or partial content of cotton fibers. |
| Ragged Left |
| The term given to right-justified type that is uneven on the left. |
| Ragged Right |
| The term given to left-justified type that is uneven on the right. |
| Railroad Board |
| A thick, coated paper used for signs; usually waterproof. |
| Readers Pairs |
| Two consecutive pages as they appear in printed piece. |
| Recto |
| The odd numbered pages (right hand side) of books. |
| Red Lake "C" |
| A common pigment for paste and liquid red inks. |
| Reducer |
| Any substance that softens and reduces the tack of ink. |
| Reel |
| The master roll of paper as it comes off the papermaking machine. It is in its original width and is then cut into smaller rolls. |
| Reflex Blue |
| Also called alkali blue. A pigment used in carbon black inks and varnishes to improve luster. |
| Register |
| The arrangement of two or more images in exact alignment with each other. |
| Register Marks |
| Any crossmarks or other symbols used on layout to assure proper registration. |
| Right Angle Fold |
| A term that denotes folds that are 90 degrees to each other. |
| Roll To Roll |
| A web press printing process where the roll of paper is printed and stored on a roll to be shipped. |
| Rub Proof |
| That stage of printed ink where the maximum dryness is achieved, and the ink will not smudge. |
| Rubine |
| A pigment somewhat redder than true magenta. |
| Runability |
| A term used to describe how well a paper runs on a printing press. |
| Run-Around |
| A term given to copy that accommodates the lines of a picture or other image or copy. |
| Running Head |
| A title at the top of a page that appears on all pages of a book or chapter of a book. |
