The mat and the frame

A portrait is finished twice: once at the bench, and again where the portrait hangs in the house it shows, on a wall chosen by somebody else. Between the drawing and the wall sit two pieces of carpentry that look like decoration and are actually protection: the window mat and the frame. Both are worth a moment of the client's attention, because the wrong housing shortens the sheet's life and the right one disappears into it.

What the mat is doing

The mat is a border of board with a window cut in it, and its first job is air. Glass pressed against paper breeds trouble: moisture condenses, the sheet sticks, mold finds the contact. The mat holds the glazing a few millimeters off the drawing and gives the paper a breathing margin, which is the difference between a portrait that lasts and one that fogs.

Its second job is optical. A wide mat, three inches or more on a standard sheet, quiets the wall around the drawing and gives the eye a place to land before the image. Narrow mats crowd the line; generous ones let the sheet read as the object it is. The mat's color is almost always a quiet white or cream, and the board must be acid-free like everything else that touches the paper, buffered board if the portrait is meant to be permanent.

The frame that suits the genre

House portraits want narrow frames. The genre is architectural; heavy molding competes with the subject and turns a modest sheet into an overdressed one. A slim wood in dark walnut or black, or a thin gilt for formal rooms, keeps the drawing in charge. The glass is worth a word too: ordinary glazing is fine in most rooms, but a portrait hanging opposite a window earns its keep with conservation glass, which blocks the ultraviolet that bleaches ink and paper over decades.

The assembly in order

The finished package stacks in one direction and should be assembled the same way every time: glazing first, then the mat with the sheet hinged to it by two archival tabs at the top edge only, then the backing board, then the frame closed over the stack. The sheet is never glued, never taped across its face, and never fixed at all four edges; paper moves with humidity and a sheet pinned everywhere buckles into waves. Two tabs at the top let it hang and breathe, which is how museums hinge paper and how a portrait deserves to be hinged.

Where it hangs

The unglamorous fact is that placement does more for a portrait's longevity than any material. Direct sun is the enemy even behind conservation glass; interior walls away from radiators and damp are the friends. The good news is that the genre's natural habitats, hallways, stairs, studies, are usually the safe ones.

The glass question

A word on glazing, because the choice confuses more clients than the frame does. Ordinary glass protects against dust and fingers and is adequate on a shaded wall. Conservation glass adds ultraviolet filtering and earns its premium anywhere the sun lands, since UV is what bleaches ink and burns paper over years. Acrylic is lighter and shatterproof for large frames and stairwells, at the cost of scratching more easily. For most portraits the decision is simple: ordinary glass on a kind wall, conservation glass wherever the afternoon reaches it.

The sheet, filed

Mat for air, frame for manners, wall for shade: the housing is simple once its jobs are named. The last sheet on this board follows the drawing out of the frame entirely, into the prints, the stationery and the small goods a portrait becomes when it leaves the original behind.