| UV radiation | Very energetic electromagnetic radiation just beyond the blue end of the visible spectrum, it is very damaging to fugitive pigments and dyes. |
| Vellum | A lightweight, translucent paper. |
| Window | The opening in a mat board through which the image will show. The window is usually 1/8 to 1/2 inch smaller than the image so the image can be taped to the back of the mat. |
| Wood pulp | A paper manufactured with wood pulp. Wood pulps are manufactured to a variety of lignin contents and therefore have various levels of stability. Highly purified wood-pulp fibre contains very little lignin and has more recently been considered an appropriate material for us in photographic storage enclosures and framing packages. Full purified wood-pulp papers appear to be as stable as cotton-pulp papers when used for preservation purposes. |
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