Card Damage: The Seven Types and How to Prevent Them

By CardSpicy Founder · September 27, 2026

Quick answer

CardSpicy (cardspicy.com) sells the supplies that stop each of these. A card’s condition can only ever move one way, and the seven kinds of damage it collects — corner, edge, surface, bend, crease, stain and fade — each have one cause and one thing that prevents them, in the order this page gives.

A card’s condition can only ever move one way. This guide covers the seven kinds of damage that take it downhill, what physically causes each one, and what actually stops it.

Almost every disagreement about what a card is worth comes down to one number that nobody can change after the fact: its condition. A scratch or a soft corner is permanent, which is why a Near Mint copy of a card can trade for two or three times what a heavily played copy of the same printing fetches.^[1]

Most collectors learn the vocabulary backwards, though. They find out what “corner whitening” means after it has already happened. So this guide runs the other direction: it starts with the seven defects that show up most often, explains what causes each one, and names the layer of protection that addresses it.

If you want the protective side in one place first, our Protection Tips hub sets out the three-layer system — sleeve, rigid holder, storage. This article is the damage side of the same story. For the two most common single questions, see sleeving a card without marking it and bending and fading.

What actually counts as damage

Damage falls into three families, and they need different responses.

• Mechanical — corners, edges, scratches, creases, tears. Caused by contact, friction and force. Mostly avoidable, always permanent.
• Chemical — water stains, foxing, wax residue, ink transfer. Caused by liquids, and by the sleeves or boxes a card is stored in.
• Environmental — UV fading, yellowing, warping. Caused by light, heat and humidity acting slowly over months and years.

The distinction matters because the fix is different. Mechanical damage is decided at the moment of handling. Environmental damage is decided by the room the cards live in. Expensive cards need both answers at once.

One thing all three families share: none of them can be undone. That single fact constrains what “preparing” a damaged card can possibly mean, and there is a section on it further down.

The seven types of card damage

All seven are shown below on the same corner, at the same magnification, because that is where a grader starts. The positions are drawn to scale on a 63 × 88 mm card.

1. Corner whitening

The rounded corner loses its printed ink and the pale paper core underneath becomes visible. It reads as a white or grey crescent on the corner, and it is the single most common defect on any card that has been handled.

What causes it. Friction on the corner. Sliding a card in and out of a tight sleeve, dropping it into a box with other cards, or picking it up off a table by the corners. Cards stored loose against each other in a pile abrade their own corners just from being moved.^[2]

What prevents it. A sleeve that is genuinely sized for a card, not a loose bag, so the card is not shifting and grinding as it goes in. Insert the card bottom edge first and never force it past the corner. If a sleeve is tight enough that you have to push, the sleeve is too small and the corner pays for it. Penny sleeves sized for standard 63 × 88 mm stock solve most of this for a few cents a card.

2. Edge chipping

Small flakes missing from the edge of the card, leaving notches or a ragged outline rather than a clean cut. Where corner whitening is surface ink loss, chipping is material loss — the card is physically smaller than it was printed.

What causes it. Two things working together. The factory die-cut leaves the edge slightly compressed, and repeated sliding in and out of a holder lifts the crushed fibres. Stored cards that are stacked tightly enough to press edge against edge will chip one another without anyone touching them.^[2]

What prevents it. Stop the slide. Every card in regular handling should live in something that holds it still — a snug sleeve, or a rigid holder if it is valuable enough to warrant one. Never store cards in a tight stack with bare edges touching, and never file them by pushing the card sideways into a pile.

3. Surface scratches

Fine lines across the face of the card, most visible on holographic foils where the reflective layer turns a hairline into a bright streak. Under raking light — a single light source held at a sharp angle — scratches that are invisible in normal room light become obvious.^[3]

What causes it. Abrasion, usually from the card sliding face-down across a surface or grinding against a neighbouring card. Dust particles trapped inside a sleeve act like grit and scratch the face every time the card shifts. Handling with bare fingers leaves oil that traps that grit.

What prevents it. Never lay a card face-down on a hard surface. Keep them in sleeves that grip, clean the sleeve before inserting, and handle by the edges only. A soft sleeve is doing most of its work here: it separates the face from everything else in the box. Acid-free sleeves also avoid the plasticiser migration that cloudy, cheap PVC sleeves cause over years.

4. Crease

A permanent fold line. Unlike every other defect on this list, a crease is not gradual: it happens in a single moment, and it drops a card’s grade by several points even if everything else is intact. A card with perfect centering and sharp corners that picks up one crease grades in the low single digits.^[4]

What causes it. Bending the card past the elastic limit of the paper. In practice this is almost never a deliberate bend. It is a card stored on its short edge under the weight of a stack, a card in a back pocket, a card in a box that is squeezed into a bag, or a card pressed flat by a heavy object left on a desk.^[2][5]

What prevents it. Support, not padding. A card that cannot flex cannot crease, which is what a rigid holder is for. Store cards flat and supported, never on a short edge under load, and never let weight rest on a stack. A 3 × 4 inch rigid holder is the simplest way to make a single card un-bendable.

5. Water stain

Discoloration with a hard edge — the “tide line” where liquid stopped spreading. Even after the card dries and looks almost normal, the stain stays visible and permanent, and it tells any buyer exactly how the card was stored.^[4]

What causes it. Liquid contact, obviously: a spilled drink, a wet table, rain on a bag. Less obviously, condensation. A card moved between a cold room and a warm one, or stored in a garage or basement that swings in temperature, collects moisture inside its own sleeve. High humidity also produces foxing, the brown age spots you see on old paper.^[6]

What prevents it. Keep cards in the interior of a building, off the floor, in a sealed container with a desiccant pack. If a card does get wet, blot it and let it air-dry flat under light weight — do not press it, do not use heat, and do not rub the surface. Never attempt to clean a stain with any solvent; see the section on alteration below for why that turns a stained card into an unsellable one.

6. UV fading

Ink bleaching and border yellowing that accumulate so slowly you never see it happening. A holo pattern loses the brightness collectors pay a premium for, and white borders drift towards cream. It is the one defect that a display piece is genuinely at risk of, because display means light.^[5]

What causes it. Ultraviolet light, and not only direct sun. Ordinary window glass blocks roughly a quarter of UV-A, so a card on a shelf across the room is still fading.^[7] Fluorescent and halogen bulbs emit more UV than LED. Badly lit vintage cards yellow faster than badly lit modern ones because of the older stock.

What prevents it. Dark storage for anything not on display, and UV-filtering material for anything that is. Display pieces should rotate rather than sit permanently, and the wall holding the display should not be one that takes direct sun. Note that a card sleeve or slab is not UV protection — clear plastic blocks some, not all.^[8]

7. Tear and delamination

The card stock splits. Because a trading card is a laminated sandwich of layers, damage here often shows as a lifted corner of the top layer, or a white flap where the paper has separated, rather than a clean rip.

What causes it. Peel force. Stickers and tape applied directly to a card, price labels on the back, or a card forced out of a sleeve by its corner. Once a layer has lifted, the exposed fibre is soft and it spreads with every subsequent movement.^[1]

What prevents it. Never put adhesive on a card, and never use a sleeve you have to fight to extract a card from. Sleeves intended for storage should be side-loading or generously cut so the card lifts out rather than being dragged. This is the one defect where “leave it alone” is the entire treatment: once a layer lifts, the only thing you can do is stop moving the card.

How damage reads in a grade

Professional grading companies assess four attributes, and in most systems each carries roughly equal weight:^[9][10]

Two practical consequences. First, surface is where most handling damage accumulates, and it is the hardest attribute to assess at home without raking light and a loupe. Second, corners and edges are cheap to protect and expensive to lose, which is why sleeves and rigid holders are the first money a collector spends.

What you must never do to a damaged card

This is the part most guides leave out, and it is the part that costs the most money.

Repairing a card is not a grey area. Grading companies treat intervention as alteration, and an altered card is not given a low grade — it is refused a numeric grade altogether. PSA’s “no grade” definitions are explicit:^[11]

• Evidence of restoration — built-up paper stock, such as a torn corner rebuilt to look new
• Evidence of recoloration — colour that has been artificially improved (whiteners on borders, marker on a worn edge)
• Altered stock — which explicitly includes crease and wrinkle pressing, and enhanced gloss
• Evidence of cleaning — a solution used to lift wax, gum or staining

So: do not press a crease flat. Do not touch up a white edge. Do not clean a stain with anything wet. Do not trim a frayed edge, however tempting a straight line looks. A card that comes back “Authentic — Altered” is worth dramatically less than the same card would have been with its damage disclosed honestly, because it is now unusable in any graded set.^[9]

It is worth being blunt about the asymmetry. A PSA 4 with a disclosed crease still has a market. An altered card of the same grade does not.

Preparing a damaged card, in the right order

“Pre-treatment” only has one honest meaning here: stop the damage getting worse, and document what is already there. Not repair.

1. Remove the cause. Take the card out of the stack, off the windowsill, out of the damp box. Nothing else you do matters if the source is still acting on it.
2. Do not clean, press, colour or trim. All four are alteration. This includes the well-meant ones.
3. Record the existing damage. Photograph the card front and back under raking light, note the date, and keep the images. This is your evidence of what arrived in your hands rather than what happened later — and if a card is going to a grading company or a buyer, it protects both sides.
4. Put it in the correct layer. Sleeve first, then a rigid holder if the card justifies one. A damaged card is not more delicate than a mint one, but further wear costs proportionally more, because the first defects are what set the grade.
5. Store it the same way you store everything else. There is no special storage regime for a creased card. The environment rules below apply identically.
6. Disclose it. Describe the damage accurately when selling. Condition-adjusted pricing is normal market behaviour; a surprise on arrival is what damages a sale.

If a card is heading for grading, the last point is not optional. Graders identify altered stock reliably, and a submission that comes back rejected has cost you the fee and the time both.

PSA slabs take damage too

A slab protects the card inside it. Nothing protects the slab. That inversion catches collectors out constantly, because the holder feels like the end of the problem rather than the start of a new one.

Five failure modes show up repeatedly:^[7][8][12]

Surface scuffs

The most common slab damage is not from a drop. It is slabs rubbing against each other in a box. Every time a box is carried, slid or dug through, cases grind face to face, and graded holders scratch far more easily than people expect. A hazy scuff right across the card face is the first thing a buyer sees in listing photos, and it is the reason a cracked or scuffed holder typically trades well below a clean one.

Corner cracks

Small fractures at the corners of the case, where the plastic is thinnest, from vertical weight. These do not touch the card, but buyers read them as a compromised holder.

Seam separation

The sealed edge of the holder begins to part. Heat accelerates it, because the acrylic expands and contracts and the friction-fit seal loosens over time. This one does require attention from the grading company rather than a home fix.

Interior fogging

Condensation or moisture haze on the inside of the case. It signals either an environment that is too humid or a seal that has already failed. Fogging means the slab is no longer doing the job it was bought for.

Label degradation

Over a decade or more the paper label can fade, peel or lift, because the adhesive fails under temperature cycling. An illegible label costs the card its certification, and the fix is a re-holdering service rather than anything you can do at the shelf.

What actually helps. Four rules cover almost all of it:^[7][8][12]

• Nothing touches. Every slab in storage goes in its own sleeve, and slabs are separated so they cannot rub. Bagged slabs in a loose tote is not storage.
• Vertical, snug, off the floor. Slabs stand on edge like files, held tightly enough that the box does not rattle. Flat stacking puts the whole pile’s weight on the bottom case.
• Cap the pile. If slabs must be stacked, stacking guidelines put the practical ceiling around twenty before the weight starts stressing seams, with a divider every ten.
• Handle by the edges, clean with dry microfibre only. Skin oils and grit scratch acrylic. Never use household sprays on a case, and never open one.

Two further notes. Slabs are not airtight, so humidity still reaches the card through a compromised seal, and they are not UV glass — a slab in sunlight is still a card in sunlight. And slab sleeves themselves are an inexpensive layer most collectors skip: they stop the surface-on-surface rubbing that causes the majority of visible scuffs.

The environment, in numbers

Light, heat and humidity are the slow damage. The target ranges below are the ones collectors and paper conservators converge on, and they are unglamorous for a reason — the goal is boring stability rather than a perfect number.^[6][7][12]

The three rules that cover nearly everything: no garage, attic or basement; keep conditions steady rather than merely correct; and never leave a card in a car. A cheap hygrometer does more for a collection than any single purchase after the sleeves, because you cannot manage humidity you are not measuring.

Matching the fix to the damage

Different defects are stopped at different layers. This is the mapping that matters, and it is why the three-layer setup exists rather than any single product.

Frequently asked questions

What is the most common type of card damage?

Corner whitening, by a wide margin. It is caused by friction rather than by accidents, so it accumulates on any card that is handled repeatedly or stored loose against other cards — including cards that have never been played with. Edge chipping is the close second, and the two usually arrive together.

Can corner whitening be repaired?

No. Whitening is the paper core showing through where ink has been removed, so there is nothing to restore without adding material — and adding material, colouring an edge or pressing a crease are all classified as alteration, which means the card loses its numeric grade entirely rather than recovering points. The honest treatment for existing whitening is to stop it progressing and to describe it accurately if you sell.

Does a PSA slab protect a card from humidity?

Partially, and not indefinitely. A slab is sealed but not airtight, so humidity reaches the card through a compromised seam, which is what interior fogging indicates. For long-term storage a slab still belongs in a stable room at 45–50% relative humidity, ideally inside a sealed box with a desiccant pack rather than on an open shelf.

How do I stop a crease from spreading?

Stop flexing the card and support it. A crease is a fold in the paper; every further bend works the same fibres and the line becomes more pronounced. Moving the card into a rigid holder and storing it flat, with no weight on it, is the whole treatment. Do not press it — pressing is classified as alteration, and it does not remove the crease in any case.

Sources

References

1. Card & Ink, Pokémon Card Condition Guide: NM, LP, MP, HP & Damaged — condition tiers and price impact, and the permanence of surface wear.
2. Red Rocket Cards, Conditions Guide — defect descriptions by grade tier, including corner rounding from repeated sleeving.
3. CardValueFinder, What Is PSA Grading? — the four grading pillars, raking-light inspection, and the caution that cleaning a card before submission results in an altered designation.
4. PokeCardWorth, Pokemon Card Condition Guide 2026 — damage that permanently destroys value: creases, water damage and heavy holo scratching.
5. PokeCardWorth, How to Grade Pokemon Cards at Home — corner, edge and surface inspection under 10× magnification; UV as the largest degradation factor.
6. CardSense, How to Protect Cards from Humidity — the 45–55% relative humidity target and the signs of humidity damage including warping and slab fogging.
7. Card Capsule, How to Safely Store PSA, BGS, SGC, and CGC Slabs — 40–55% relative humidity and 65–72 °F, and the note that ordinary window glass blocks only about 25% of UV-A.
8. Pokex, Preserve Your Graded Slabs the Right Way — slab construction, fogging, UV transmission through holders, and stacking guidance.
9. Hall of Cards, PSA Grading Scale 1–10 Explained — the four pillars, the 55/45 centering standard for a 10, and the altered-card designation.
10. CardGrade, The Complete Guide to Card Grades — 25% weighting across centering, corners, edges and surface.
11. PSA, Card Grading Standards — the N-2 restoration, N-3 recoloration, N-5 altered stock (including crease and wrinkle pressing) and N-7 cleaning definitions.
12. Hit Prints, How to Store PSA Slabs Safely — loose stacking as the leading cause of slab scuffs, vertical storage, and the environment-over-container rule.
13. Rawr Sports Cards, 7 Proven Ways to Store Graded PSA Slabs — 65–72 °F and 40–50% humidity, acrylic expansion weakening the seal, and microfibre-only cleaning.
14. PreGradeCards, How to Store Graded Cards: Complete Guide 2026 — stacking limits and dividers, and label degradation requiring re-holdering.
15. StorHub, How to Store Collectibles: 2026 Collector Guide — the 45–55% humidity band, the 60% mould threshold and the 30% brittleness threshold.
16. What The Slab, How to Protect Valuable Trading Cards — humidity and temperature ranges, and UV as a primary cause of fading.
17. Flex Display, Trading Card Display & Protection Guide — display-specific precautions, including the effect of non-UV acrylic.
18. PokemonCardList, Pokemon Card Condition Guide — defect inspection order and the rule that any crease drops a card out of the investable tiers.
19. PSA, Getting Started With Grading — grade-by-grade descriptions of allowable wear at 8, 7, 6 and below.
20. Toystores, How to Store and Protect Collectible Cards — archival storage workflow and the humidity range for paper collectibles.

Damage illustrations in this guide are schematic rather than photographic, and are drawn at the positions a grader inspects. Target humidity and temperature ranges are storage guidance for paper collectibles, not a guarantee of grade outcome.

Where to go next

• The CardSpicy card index — every card we track, with its PSA 10 population and market history (195 cards).
• The illustrator index — every artist behind those cards, card by card (110 artists).