How can I remove a stuck lid from a tin without damaging it?

Introduction

There's probably nothing more maddening than trying to open a tin whose lid refuses to budge, whether it's an imported can of pate or a home-canned jar of strawberry preserves. It's hard to remove without damaging the lid, and can be very difficult, at all. Yet by learning how to go about it properly, you can still get a lid unstuck from a tin without harming either part--neither the can nor the lid. There's a variety of methods at our disposal and in this article we'll take a look at some common kitchen situations where this time-saving trick might come in handy.

Evaluating the Situation

Before attempting to remove a stuck lid, it's important to understand how it got stuck in the first place. Common reasons are that the lid has created a vacuum, is rusted or has swelled due to changes in temperature or humidity. Look for visible signs of damage or deformity in the can itself. Also consider what kind of lid it is; screw-on lids may pose a very different challenge from snap-on or peel-off ones.

Conventional Methods

One traditional method to release a tight lid is to pour hot water over the can. The steam that forms expands the metal and breaks the seal. Hold the tin firmly in your hand and direct the water from a tap specifically at the joint between lid and rim. Be patient; it may take several minutes before steam does its work.

Another conventional method is to use hot air. Blow dryers are quite effective in this regard. A flow of heat is directed at the edge of the lid. The temperature forces the air inside the tin to expand, leading to pressure and thus eventually a loosened lid. Although you should be careful not get the item too hot--or you will suffer burns and in certain cases spoil your contents.

Mechanical Aids

For example, rubber grip tools--like jar openers--or tongs and a gripping device designed to work on marginal edges could help immensely in loosening the top of the worst-to-do-up lids. The heavy end of this type device is that of course its handle-operated jaw which closes around and grabs as a lever with leverage off with all sorts, including things such grim as bottle tops. To loosen unyielding jar lids, hold the device securely onto the lid's edge with your free hand and lever it to open with steady pressure.

For a more manual approach the twist can be made by utilizing a tapering object such as the edge of a knife or a can opener. Carefully insert the tool between the lid and the tin's rim, being careful not to scratch or puncture the surface. Once you've created a small gap (of about 1/8 inch), you can use the tool to pry the lid loose.

Chemical Assistance

Sometimes, a little chemical assistance can go a long way. Applying a lubricant like oil or soapy water to the lid's edge helps shove it loose and the lubricant goes halfway in between the lid and tin, making it easier to twist open. The asparagus method is a peculiar, even grotesque technique where, using a piece of asparagus as a lever, you work assiduously to wriggle the lid free. By inserting the stem into the seam between the lid and the tin and then twisting it works a treat--even with screw-on lids that age seems fastened on permanently tight.

Advanced Techniques

For a more dramatic approach, try the cold shock method. Place the tin in the freezer for 10-15 minutes. The rapid drop in temperature causes the metal to contract, which could detach a vacuum-sealed lid. after giving it cold shock treatment, rinse the edge of the lid off with hot water and the metal expands, making it easier to twist open. Know what you're doing before starting on this next one: also advanced technique is counter- pressure method. Place a cloth or rubber mat on a solid work surface and put the lid over it firmly. Slowly increase the pressure currently being applied to the top of the lid, but don't exceed your strength level to avoid breaking down that small air-tight seal.

However, when you try to remove a stuck lid never use your bare hands or other bodily force. Find some suitable instruments and protective gear as well: gloves will keep you safe from the tin's rough edges, while a towel can help keep you warm by insulating against the tin's cold Even though you may be in a hurry or feel impatient, avoid sudden movements or exerting force that might hurt yourself and do no good for the box. If a stubborn lid still won't come off after several attempts, it may be best to seek help from someone who knows what they're doing. This will prevent the contents or container from being damaged.

A measure to save future trouble with stuck lids is to keep tins in a cool, dry place with no temperature fluctuations. Before sealing a tin, apply a thin coating of oil or wax around the rim to prevent a partially airtight vacuum lock from forming. In choosing tins, select ones with designs for opening the lid that are easy to use.

Summary

Removing a stuck lid from a tin seems difficult at first but once you take enough time and apply the right skills, it can be done without causing harm. Whether you use traditional methods, mechanical aids or advanced techniques depends on the state of the tin and your own conditions. The vital thing is to look always for a well-considered and informed way ahead Whether not you prefer, with practice everyone can become skilled in opening even those stubborn cans.