To tighten a jar, you typically screw the lid or band onto the jar until it's "fingertip tight." This means tightening it as much as you can comfortably with your fingers, without using any tools.
Here's a more detailed explanation, particularly relevant for canning:
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For Canning Jars (Two-Piece Lids):
- Placement: Place the treated lid on the filled jar, ensuring it's centered. Hold it in place with your fingers.
- Tightening: Screw the band down until it is "fingertip tight." This is crucial for proper sealing during the canning process.
- Important Note: Avoid over-tightening after processing. Over-tightening can prevent proper venting and sealing, potentially leading to spoilage or jar breakage.
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For Regular Jars/Containers (Not Canning):
- Simply screw the lid on until it feels snug and secure.
- Avoid excessive force, as this can damage the lid or jar.
Essentially, the goal is a firm, but not overly-tight, seal. You should be able to easily remove the lid later without extreme effort.
