This is understandably frustrating for anyone who wants to actually play with their foil cards. Humidity moisture in the air is the biggest reason why foil cards curl. Since the front of the Magic card is made from mylar, it won't expand or contract when exposed to the moisture in the air. However, the back of foil cards are still made from cardboard and will expand or contract based on how much moisture has been absorbed into the material.
If you open a curled foil in a fresh booster pack, that means the humidity where you are is significantly different from the humidity where the card was printed. The modern scourge of curled foils is most likely due to a difference in climate between where Wizards of the Coast prints cards now, and where they printed them historically. If you are in a particularly humid environment or if the material of the card seems to be holding excess moisture, the cardboard backing will expand while the front of the card stays the same size.
This causes the corners and edges to curl inward toward the foil face of the card. If you place this card on a table, the center will be touching the table while the edges of the card will curl upward and not touch the table. Conversely, some cards will resist moisture better than others based on the material, or if the environment you find yourself in has a dry climate.
In this situation, the cardboard backing of the card will contract inward while the foiling stays the same size. This causes the edges to curl toward the cardboard backing of the card. If you place this card flat on a table, the edges will touch the table while the center of the card will bow outward away from the table.
If your foil is only slightly curled in either direction, try placing it in between the pages of a heavy book and then stack a few more books on top of that. After leaving it under the weight of the books for a day or two, inner sleeves also known as perfect fit sleeves will help to keep your cards flat.
These are small sleeve-like casings you can put on your cards that fit inside a normal-sized sleeve. Not only will inner sleeves help to resist the card's natural tendency to curl, but they will also create a more airtight environment to prevent further moisture from reaching your card. If the edges of your card are curling towards the cardboard backing, you will need to add moisture to your card.
There are safe ways to do this without watering your cards like houseplants; we certainly don't recommend introducing your cards directly to water in any way, shape, or form. However, there is a type of packet that can help regulate the air near your foil cards and keep them from curling. These packets are referred to as humidor packets, which maintain a consistent, desirable moisture level when stored near your cards.
These can help prevent foils from curling or even uncurl some of your foils that have already started to curl. If just storing humidor packets with your foils isn't doing enough, you can build a makeshift rehydration chamber to maximize their effectiveness.
You will want a sealable, air tight container to create the main portion of your rehydration chamber. Using a see-through lid or container is beneficial, as it will let you track the progress of your foils as they go through the flattening process. You will want to have a raised flat platform on the inside of your container for your card s to rest on without directly touching the bottom of your container.
The platform should be rigid and preferably waterproof as well. I recommend a deck box or clear plastic case for your platform if you are using a small chamber. Place your platform into the center of your chamber. Place your cards onto the center platform. Around the edges of the platform, add humidor packets as necessary based on the size of your chamber.
For smaller chambers you will likely only need one humidor packet whereas for larger chambers you may need two or more! The moisture content of a card will vary based on individual cards as well as the climate of your region. A card may take a few days to begin to flatten, so we recommend checking on the card periodically while it is in the chamber.
Film alignment has to be precise - even slight misregistrations can ruin an entire sheet. The time period around Future Sight - Lorwyn - Shadowmoor had very dark foils. You can peel the foil laminate off a traditional foil card, which leaves the paper card with a blank white front.
From the Vault sets were printed using a special foiling process that was unique to the series. They were printed on a foil stock that is twice as reflective, and treated with a varnish. They feel much slicker to the touch and weigh a notable amount more than a regular foil. From the Vault cards are also exceedingly hard to write on e. However, these cards were also notable for having many production issues, like one-pixel vertical lines going down the card-face.
They were also more prone to curl, regardless of moisture but moisture makes it worse. Commander Legends introduced the "foil-etched" treatment. These cards use a brand-new foiling process that looks different from previous foils. Foil-etched is sparkling shiny when touched by light. It doesn't make use of a foil laminate, but instead uses metallic paint. It doesn't cover the whole card, but only highlights specific parts. The foil-etching process presents an interesting twist when dealing with older cards in Modern Horizons 2.
For Innistrad Double Feature the usual "rainbow" foil treatment was swapped for an unique "silverscreen" foil that enhanced a cinematic monochrome effect. Foils are notoriously harder to keep in Near Mint condition than non-foil cards. Traditional foil Magic cards are made of two things, cardboard and metal foil. This water is partially what gives paper flexibility without snapping it. If you remove the water, the paper becomes more brittle.
If you add more water, it becomes more flexible. One way this occurs naturally is through humidity, which can cause the water content inside a card to fluctuate.
It's this fluctuation that causes cards to grow or shrink, on a virtually imperceptible scale. With non-foil cards, this doesn't cause a problem because the entire card expands evenly. But on foils, this can cause the cards to curl because while one side of the card is made of cardboard that changes size when water is added or removed, the other side is covered in a metal foil layer that does not expand through moisture.
If you store your cards in a very humid environment, the cards will curl with the backside of the card bulging out because the backside of the card has room to expand while the front half is fixed in place by the foil layer.
But if the humidity is lowered, this causes the water to go down, causing the cardboard to shrink, and the front side to bulge out.
But humidity is not the only factor that causes cards to curl. Much like how humidity causes the cardboard to grow and shrink, the same happens to the foiling when exposed to heat, because heat causes the metal to expand, and lower temperatures cause it to contract.
These two factors control how much a card warps. If the temperature and humidity are at the temperature the cards were printed at, they won't curl. If you keep your cards in a super dry environment and under a lot of heat, you are going to get extreme curling. Keep them super cold and damp, and you'll get extreme curling in the other direction.
As such, it can be used with the Un-card Super Secret Tech , that care about premium cards. With the introduction of Booster Fun in Throne of Eldraine the Premium range was expanded upon with showcase cards, extended-art and borderless planeswalkers.
The Premium Deck Series were Box sets that consisted of all foils.
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