Tea Leaves — Magnet Screen for Iron Filings

Why a magnet works here

FSSAI's rapid tea test uses a simple physical principle: iron filings are magnetic. Tea is spread on clean paper and a bar magnet is moved over the sample. If metallic iron particles are mixed in, they can cling to the magnet. This is one of the clearer Kitchen Check methods because it does not depend on colour or smell.

Use a clean magnet

A magnet already carrying workshop dust, staples or iron particles can create a false result. Wipe it clean before use and inspect it first. The paper and tea should also be dry. Water can make particles stick mechanically and make the result harder to interpret.

Use only a small sample

Spread a small amount in a thin layer so the magnet can pass close to most of the sample. There is no need to test the whole packet. If the screen is suspicious, preserve the majority of the product untouched for traceability or testing.

This does not test every metal

A magnet mainly helps detect magnetic iron-like particles. It does not prove the absence of aluminium, lead, copper or non-metallic contaminants. A clean magnet result should therefore say 'no obvious magnetic filings detected', not 'metal-free tea'.

Do not return tested tea to the jar

If a magnet has touched the sample or particles have been captured, keep the tested portion separate and discard it. Do not mix it back into the main tea container. This avoids reintroducing suspicious material and keeps the main sample cleaner for any official follow-up.

A strong positive deserves escalation

Visible iron filings are more concerning than an ambiguous colour screen. If multiple metallic pieces cling to the magnet, stop using the product and record the brand, batch, seller and purchase date. FSSAI consumer channels can guide complaint or testing routes.

Recommended result wording

Use 'No obvious magnetic filings seen', 'A few particles unclear—repeat once with a cleaned magnet', or 'Visible magnetic filings captured—screen suspicious; stop use and document'. This keeps the result practical and specific.

Keep the magnet away from electronics and medical devices

A strong magnet can affect some electronics, cards and certain implanted medical devices. Kitchen Check should include a simple handling note: perform the test on a clear table away from phones, magnetic cards and sensitive equipment. Users with a medical implant that may be affected by magnets should not perform the test themselves and can ask another person or use official testing.

Use a simple white tray if paper moves

If loose paper keeps shifting under the magnet, place it on a flat white tray or board. The goal is to keep the tea in a thin, stable layer so the magnet can pass slowly and safely. Do not hold the sample in the hand while moving a strong magnet over it.