UV‑filtering acrylic and museum‑grade glass can block up to 99% of harmful ultraviolet while offering clarity and, in some cases, anti‑reflective coatings. Acrylic is lighter and safer, glass resists scratching. Match glazing to environment, consider static with loose papers, and always retain an air gap to avoid contact.
Choose lignin‑free, alpha‑cellulose or cotton rag boards. Buffered boards neutralize acids, but unbuffered may be preferable for certain sensitive dyes or envelopes with historic adhesives. Use archival spacers to prevent glazing contact. Backings should be inert, with barrier layers that slow pollutants from wood frames or room air.
Mount with archival corners, polyester sleeves, or Japanese tissue hinges applied using wheat starch paste for reversibility. Avoid pressure‑sensitive tapes and PVC. Float mounts can use rare‑earth magnets with inert coatings and hidden steel, ensuring minimal intervention and easy adjustments if future conservation needs arise.
Solar shades, UV‑blocking window films, and blackout curtains keep sun at bay. Dimmers fine‑tune brightness, while moving displays away from windows instantly reduces risk. Remember inverse‑square law: modest increases in distance shrink intensity more than expected, often without noticeable change in perceived clarity.
Create calm conditions behind the glazing using edge seals, gaskets, and sorbents like silica gel or microchamber papers that trap acids and peroxides. Marvelseal or aluminum‑laminated barriers isolate wood acids. These unobtrusive layers buy time, stabilizing fragile papers against pollutants and seasonal fluctuations that would otherwise accumulate damage.
Plan rotations like a curator: display sensitive items for limited periods, track lux hours, then rest pieces in dark storage. A simple logbook supports consistent decisions. Pair rotations with facsimiles for continuous storytelling, preserving originals while audiences still enjoy design, plate varieties, and postal history narratives.
Use inert plastics like polyester (Melinex, Mylar), polypropylene, or polyethylene, avoiding PVC. Select alpha‑cellulose or cotton rag sheets, free of optical brighteners. Skip pressure‑sensitive tapes; opt for Japanese tissue and wheat starch paste. These fundamentals quietly prevent stains, ghosting, and adhesive migration that haunt collections later.
A window mat and discreet spacers ensure stamps never touch glazing, preventing adhesion, condensation marks, and abrasion. That tiny air gap is an unsung hero, smoothing microclimate swings and protecting delicate perforations, grills, and embossed features that define originality and value across generations of viewing.
Microchamber boards scavenge acids and peroxides, while aluminum‑laminated barriers slow off‑gassing from frames. These layers are invisible in display, yet constantly protective. Coupled with dust seals and careful tape selection, they create a calm sanctuary where vulnerable inks and gums can age with dignity.
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