Lorcana Foil Curling: Why It Happens and How to Store Foils Safely

Pull a beautiful Lorcana foil, sleeve it, come back a week later, and it is bowed like a potato chip. This is one of the most common frustrations in the game, and it generates a steady stream of terrible advice. Let's cover why it happens, how to store foils so it happens less, and — importantly — what not to do.

Why foils curl

A trading card is layered paper stock. A foil card adds a thin metallic-film layer to one face. Paper absorbs and releases moisture as ambient humidity changes; the foil layer does not. When the paper side expands or contracts and the foil side stays put, the card bends — the same reason a bimetallic strip curls in a thermostat.

That is why the curl direction changes with the seasons: in humid conditions the paper side swells and the card bows one way; in dry conditions (winter heating is a classic culprit) it shrinks and bows the other. Lorcana's foil treatments, including the heavy cold-foil-style finishes on chase cards, make this especially visible. It is a property of the card's construction, not a sign you did something wrong.

The good news: mild, humidity-driven curl is usually reversible by the same mechanism that caused it. Return the card to a stable, moderate environment and it will often relax substantially on its own over days to weeks.

Humidity control: the actual fix

The single highest-impact thing you can do is stabilize the environment your cards live in.

• Target roughly 45–55% relative humidity. You do not need lab precision; you need to avoid extremes and, above all, avoid swings.
• Buy a cheap digital hygrometer. They cost about as much as a booster pack and take the guesswork out. Put it wherever your cards are stored.
• Keep cards in the most climate-stable room you have. Interior closets beat garages, attics, and basements. Avoid exterior walls, windowsills, radiators, and vents.
• Use a storage container that buffers the environment. A closed box or case slows down humidity swings even without any additives.
• If your climate is persistently dry or damp, two-way humidity-control packs (the type sold for instrument cases and cigar storage, commonly at 49% or similar setpoints) inside a closed container work well. In seriously damp spaces, silica gel packs help — just do not entomb cards in an ultra-dry box, because over-drying curls foils in the other direction.

The sleeve-and-semi-rigid setup

For foils you care about, the community-standard stack is the right one:

1. Penny sleeve first. A snug, soft inner sleeve protects the surface from dust and micro-scratches.
2. Semi-rigid holder second (the "Card Saver" style used for grading submissions, or an equivalent). The gentle, even support of a semi-rigid discourages the card from expressing its curl without clamping it.
3. Store vertically in a snug box. Cards packed comfortably upright, supported on both sides by neighbors, stay flatter than cards lying loose.

Toploaders are fine for handling and transport, but a curled card inside a roomy toploader has space to keep its bow. For long-term flat storage of curl-prone foils, snug and evenly supported beats hard and roomy.

Binder storage works for foils too, provided the binder has side-loading pockets, lies flat or stands fully upright, and lives in that same stable environment. Overstuffed binders that bow as a whole will happily teach every card inside them to bow along.

What NOT to do

This is where the internet will hurt your cards. Popular "fixes" circulate constantly, and several of them cause permanent damage:

• Do not press foils under heavy weight — no stacks of textbooks, no clamping between boards overnight. Forcing a curled foil flat can crease the foil layer, crack the surface finish, or leave impressions. The damage is permanent; the curl was not.
• Do not use heat. No irons, no hair dryers, no sunny windowsills. Heat can delaminate layers and warp the card worse.
• Do not use moisture directly. No damp-cloth tricks, no steam, and absolutely no soaking. Beyond wrecking the card, deliberately altering a card's structure crosses an ethical line: a card whose condition has been manipulated and then sold or submitted for grading without disclosure is a misrepresented card.
• Do not "counter-bend" cards by hand. Flexing a foil against its curl risks creasing it, and a crease turns a minor annoyance into a damaged card instantly.

Our position at Brich House is simple and non-negotiable: we never press, soak, heat, clean, alter, or restore cards — ours or anyone else's. Safe storage and stable humidity are the only interventions we endorse, because they are the only ones that work with the card instead of against it.

What this means for grading

Graders evaluate cards as they arrive. A foil with a pronounced bow can be penalized, and transit itself exposes cards to humidity swings. If you are planning to submit a curled foil, the patient path is the right one: get it into a stable environment in a penny sleeve and semi-rigid, give it weeks, and reassess. Many curls relax enough on their own. If a card will not settle, that is useful information for deciding whether it should be submitted at all.

Stabilizing, inspecting, and safely packaging foils before submission — and being honest when a card is not ready — is part of the prep work we do in Brich House's grading concierge service.