Collector's Resource · UV Protection
Why Do
I Need
A Display?
Your graded slab protects against handling damage — but does nothing to stop light. See what UV exposure does to comics and cards that were never properly protected.
The Science of Fading
Photodegradation occurs when UV radiation — from sunlight and standard indoor lighting — breaks down molecular bonds in ink pigments. The damage is cumulative, invisible at first, and completely irreversible. Neither CGC nor PSA slabs offer meaningful UV filtration; their polycarbonate shells are transparent to the wavelengths that cause damage.
Even indirect or ambient window light is enough to shift colors over months and years of display. Collections near fluorescent lighting face the same risk. The only practical protection is a UV-filtering display enclosure.
Ink colors degrade at different rates. Yellow pigments are the most vulnerable — they begin breaking down almost immediately. Metallic foil and holographic finishes on trading cards are also susceptible, shifting from crisp silver to muddied gold or brown as the yellow ink layer beneath degrades.
| Original Color | Fades Toward |
|---|---|
| Yellow | →Off-White / Beige |
| Green | →Washed Cyan |
| Blue | →Pale Cyan / Grey |
| Red | →Orange → Yellow → White |
| Purple | →Cyan / Blue-Grey |
| Gold / Foil | →Brown / Desaturated |
| Black | →Grey (most resistant) |
The Evidence — Side by Side
Both copies hold an identical PSA Mint 9 — yet the difference is glaring. The damaged copy's silver foil border has yellowed to gold, and the holographic surface has lost its crisp metallic quality. The pristine copy retains its original silver finish and vibrant card art. This is a textbook example of UV damage to metallic foil: yellow pigment layers degrade first, causing silver tones to shift warm. Same grade, dramatically different visual presentation — and a significant gap in market value.
Both copies share the same historic key status — the first appearance of Supergirl — but their covers tell entirely different stories. The 4.0 on the left shows significant desaturation: costume colors have muddied and background detail has softened. The 7.5 on the right retains the bold yellows, deep blues, and rich reds of its original 1959 printing. In Golden and Silver Age comics, color vibrancy is one of the primary drivers of grade — and of value. Light damage is often what separates a mid-grade copy from a high-grade one.
The Ancient Mew promo is one of the most visually striking UV-damage examples in the Pokémon market. The card on the left has undergone a full color shift: the silver metallic finish has converted to a warm gold-brown, and the black background has taken on a brownish cast. The card on the right shows the intended printing — cool silver borders, crisp holographic art, and strong contrast. Both carry a PSA EX-MT 6 label. PSA has historically downgraded UV-damaged copies or marked them Authentic — here the discoloration was assessed as minor enough to retain the numeric grade, but the visual and value impact is anything but minor.
⚠ The Slab Doesn't Protect the Color
CGC and PSA slabs authenticate and encapsulate — they do not block light. Both use standard polycarbonate that transmits the UV wavelengths responsible for ink degradation. Displaying a slab near a window, under fluorescent tubes, or in ambient room light without UV filtering exposes your collection to the same damage shown on this page. A UV-blocking display is the only barrier between your collection and permanent, irreversible color loss.