How to protect antiques and textiles from sunlight

Sunlight fades and weakens old furniture and textiles, and none of that damage can be reversed. Dyes lose their depth, oak and walnut bleach or darken unevenly, and the fibres in silk and wool grow brittle enough to split along a fold. Exposure builds up over years rather than one hot summer, which is why a piece can look tired after a decade in the same spot.

Keeping a house in gloom isn't the answer, so the question is how to cut the dose while still enjoying daylight. Most of it comes down to where a piece sits, what the glass filters out, what covers the window, and how often anything gets moved.

Which pieces suffer first

Natural dyes go first, and reds usually fade ahead of blues, so a pattern loses its balance while the wool around it still looks sound. Silk is the most vulnerable of the common fibres, and old silk carpets need more careful treatment than wool ones for that reason. Watercolours, printed paper, veneers and French polish react as well, while stone, ceramic and glazed pottery barely register it.

The glass itself

Modern glazing does some of this work before light reaches the contents of a room. Mainstream Windows supplies coated glass as standard, and those coatings hold back a meaningful share of ultraviolet along with some heat. Older single glazing filters almost nothing, so a room with original sashes and valuable pieces in it is the one to deal with first, whether through new units, secondary glazing or film on the existing pane.

Where things stand in the room

South and west-facing windows deliver the longest and strongest exposure, so the wall opposite them is the worst place for a marquetry chest or an embroidered cushion. Reflected light counts too, and pale paving or a glass roof outside bounces ultraviolet into rooms that never see direct sun. Moving a piece a metre or two back, or turning it so the same face isn't always lit, makes a measurable difference over a few years.

What goes over the window

Window coverings matter more day to day than the glazing, because they can be adjusted around how the room is used.

Lined curtains: A cotton or blackout lining cuts the light and protects the curtain fabric itself, often the oldest textile in the room.

Blinds and shutters: Closing them in rooms nobody is using removes the worst of the exposure and costs nothing but a habit.

Applied film: Clear film inside the pane filters most ultraviolet without changing the view, though visible light fades dyes too, so it works best alongside curtains.

Rotating and resting pieces

Turning rugs end to end once or twice a year evens out wear and fading, standard advice among specialists in caring for antique Oriental rugs. Small textiles and cushion covers can be rested in a drawer for months, wrapped in acid-free tissue rather than plastic. Photographing a piece when it arrives gives you something to compare against later, since gradual fading is nearly impossible to judge from memory.

Light damage is one of the few problems in an old house that's both preventable and permanent, so the effort belongs at the start. Walk each room on a bright day, see where the sun lands, and move the pieces you'd most regret losing.

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