oxygen and moisture
water
bleach or vinegar
Water and air in combination will rapidly cause iron to rust.
The time it takes for a needle to rust can vary depending on the environment. In a humid or damp environment, a needle can begin to rust within hours or days. However, in a dry environment, it may take weeks or even months for a needle to start rusting.
it combines with the oxygen in the air
Cause the iron to corrose-oxidize-rust.
Air, iron and water will cause the iron to rust.
is because they react to the iron and form rust
Yes, you can remove rust from a sewing needle using a few methods. Soaking the needle in vinegar or lemon juice for a few hours can help dissolve the rust, after which you can scrub it gently with a soft cloth or fine steel wool. Alternatively, using baking soda mixed with water to create a paste can also effectively remove rust. After cleaning, be sure to dry the needle thoroughly to prevent further rusting.
Typical sewing needles are stainless steel. Normally they do not rust, but can under severe conditions.
water and iron. Creating iron oxide aka rust.
An atmosphere rich in oxygen, water, acids.