Almost all damage to artwork in ordinary homes is slow, cumulative, and invisible while it is happening. There is no dramatic event. The picture simply looks a little worse each decade until one day you compare it to a photograph from twenty years ago and see it.
A frame is a small piece of environmental engineering aimed at five specific threats. It handles four of them well and one of them not at all.
1. Light
What it does: ultraviolet breaks the chemical bonds in pigment. Colours shift and fade, paper yellows, and the damage is cumulative and permanent. Nothing brings it back.
What stops it: UV-filtering glazing, which removes about 99 percent of the ultraviolet before it reaches the surface.
What glazing cannot do: stop visible light, which also fades pigment more slowly. Placement still matters. See UV glass and glazing.
2. Acid
What it does: the mat and backing board burn a brown line into the artwork from the edges and the reverse, over ten to fifteen years.
What stops it: conservation or cotton rag board throughout, and reversible hinges rather than tape. See acid-free mats and backing.
3. Moisture
What it does: paper takes up and gives off moisture with the room, expanding and contracting as it goes. Restrained at the edges, it cockles into permanent waves. In a bad case, damp behind glass grows mould, which stains from within the fibres.
What stops it: hinging at the top edge only, so the sheet can move freely, plus a sealed package that keeps the humidity swing outside. See framing art for kitchens and bathrooms.
4. Dust, dirt and airborne grease
What it does: settles on the surface and, over years, becomes part of it. Cooking grease is the serious one: it is sticky, it traps dust, and it forms a film that a conservator has to remove with solvents.
What stops it: the glazing at the front and a dust seal at the back. On a canvas, which has no glazing, a backing board on the reverse of the stretcher is the equivalent and is the most-skipped useful step in framing.
5. Handling and knocks
What it does: corner dents, punctures, and the single most common way a painting is destroyed, which is being dropped.
What stops it: the frame itself, which takes the contact instead of the artwork, plus hanging hardware rated well above the finished weight and fixed at two points. See hanging hardware for framed art.
The one framing cannot help with
Heat. Nothing in a frame protects against a warm wall. Above a working fireplace, above a radiator, or on a wall that gets hot afternoon sun, the temperature cycles daily. Everything in the package expands and contracts at a different rate, the paint film gets brittle, and on a canvas the tension changes with every cycle.
There is no glazing and no board that fixes this. The only answer is to hang the picture somewhere else. If a painting must go over a fireplace, a mantel that projects well forward helps, and the fireplace being decorative rather than working helps a great deal more.
The order to spend money in
If the budget will not cover everything, this is the priority:
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Conservation board and reversible hinges. Cheap, and prevents the most common permanent damage.
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UV-filtering glazing. The single largest gain for anything on paper.
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Correct hardware. Because dropping it undoes everything else at once.
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Anti-reflective upgrade. Real, but it is about seeing the work, not preserving it.
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The frame itself. Appearance. Spend what is left.
Most people do this list backwards, choosing the moulding first and economising on the glass and board. A plain frame with proper glazing and conservation board will outlast a beautiful frame with ordinary glass and cardboard, and it is not close.
Does a frame need a backing board on a canvas?
It is not required, and it is one of the most worthwhile things you can add. A thin board across the back of the stretcher keeps dust and insects out of the cavity, cushions knocks from behind, and slows the humidity swing reaching the canvas. It costs very little.
How long does a well-framed work on paper last?
Generations, kept out of direct sun. The materials in a conservation package are chosen specifically not to be the thing that fails. What limits the life of most framed art is not age, it is where it was hung and what was put behind it.
Should I reframe something that looks fine?
If it was framed more than about twenty years ago and you value it, it is worth opening. The damage that matters is happening behind the mat where you cannot see it. Opening a frame to look costs almost nothing and often finds cardboard and tape that should come out.
