What Actually Protects the Sheet

Start with the glass, because light is the main enemy. Standard glazing blocks almost nothing, while UV-filtering glass or acrylic screens out the majority of harmful wavelengths. Conservation glass adds a modest considered over plain glass, and acrylic has the advantage of weighing less and shattering safely. For a Bernard print of any real size, acrylic is usually the better call.

Behind the print, everything should be acid-free. That means an alkaline-buffered mat, an acid-free backing board, and a barrier layer between the two if the framer cuts corners. Ordinary cardboard mats yellow within a few years and leave a brown ghost line on the paper margin that no later treatment fully reverses. Ask the framer directly whether the package is museum grade. A competent shop answers without hesitation.

Mounting Choices That Can Cost You

The mounting method is where value is quietly destroyed. Dry mounting, where the print is bonded to a board with heat-activated adhesive, is irreversible and should never be used on anything worth keeping. Pressure-sensitive spray adhesives are worse. The correct method is hinging, using small tabs of Japanese paper and wheat starch paste or archival tape, attached to the mat rather than the backing so the print hangs freely.

Hinging is reversible. That word carries real weight for resale, because a buyer or dealer will ask how the print was mounted before making an offer. A print hinged properly at the top edge can be removed decades later with no trace. A print dry mounted onto foam board has lost a measurable share of its value the moment the iron touched it.

Non-Negotiables

Where and How It Hangs

Placement does more for longevity than any frame upgrade. Direct sun will fade pigments and yellow paper even behind UV glass, which filters most but not all harm. A wall that never receives direct sun, ideally on an interior wall rather than one shared with a chimney or a bathroom, is the right home. Humidity swings warp paper and encourage foxing, the small rust-colored spots that collectors discount.

Keep the print away from heat sources and from exterior walls in damp climates. A stable room between roughly 18 and 22 degrees Celsius with moderate humidity suits paper of any age. If the print is a valuable period impression rather than a modern reproduction, consider having a paper conservator look at it before framing. For a contemporary reproduction of Bernard's work, the same materials apply, though the stakes are lower and the same frame will simply last longer.