How to test your chai patti for adulteration at home

Four tests, all of them free, and you can do the first one in a glass of cold water in two minutes. Real adulteration in loose tea is mostly added colour, exhausted leaf sold as fresh, or bulking with something that is not tea. Every one of those leaves a trace you can see at your own kitchen counter, and you do not have to take anyone’s word for it, including ours.

There is a lot of talk in tea marketing about adulteration and very little instruction on how to check for it. That is the wrong way round. Any brand can allege that everyone else’s tea is impure; almost none of them will tell you how to test the pack in your hand, because that test also applies to theirs.

So here are the tests. Run them on our tea. Run them on whatever you are drinking now.

Is chai patti actually adulterated in India?

Sometimes, and it is worth being accurate about what “sometimes” means rather than either dismissing it or selling against it.

Adulteration of loose tea is a real, documented offence, and the Food Safety and Standards Act treats it as one. Under the FSSAI standards, tea must be free from “extraneous matter, added colouring matter and harmful substances”, and no synthetic colour is permitted in tea at any level. It is not a grey area and it is not a matter of house style: colour in tea is illegal.

What that means in practice is that adulteration is a crime committed by unbranded, unsealed, loose tea sold by weight from a sack, far more often than by anything with a label, a batch code and an FSSAI licence number on it. The risk sits at the bottom of the market, not across it. A brand telling you the whole industry is poisoning you is describing a food-safety emergency that would have inspectors in every factory in Assam, and reporting it in a caption instead of to FSSAI.

Test 1: the cold water test

The most useful two minutes you will spend on this, and the one that catches added colour.

1. Fill a clear glass with cold water. Cold, not warm.
2. Drop in a teaspoon of dry chai patti.
3. Leave it alone for two minutes and watch.

What good tea does: almost nothing at first. Real tea needs heat to give up its colour. You will see a faint, slow bloom of pale gold creeping down from the granules after a minute or two, and the water stays largely clear.

What added colour does: it runs. Streaks of colour come off the granules immediately and sink in visible ribbons, and inside two minutes the glass is tinted. Dye is water-soluble at room temperature; tea is not, or not to any degree that looks like that.

If the water is coloured before the granules have even softened, you are looking at something that was added.

Test 2: the wet tissue test

The same principle, and it makes the evidence something you can hold up.

1. Wet a plain white tissue or a sheet of kitchen paper.
2. Sprinkle a pinch of dry tea across the wet patch.
3. Wait a minute, then tip the granules off.

Clean tea leaves the paper more or less unmarked, perhaps faintly damp-brown where a granule sat. Added colour leaves distinct stains, often orange or brown-red, in the shape of where the granules were.

Rubbing a little of the wet tea between finger and thumb does the same job. If your fingertips come away dyed, that is not tea coming off.

Test 3: the exhausted leaf test

This one catches a subtler and more common fraud than colour: tea that has already been brewed once, dried, sometimes re-coloured, and sold again.

Exhausted leaf has given up most of what it had. It behaves differently from fresh tea in ways you can feel and smell before you taste anything.

The last row is the one people never look at. Tip the strained leaf out of the strainer and look at it. Good Assam CTC leaves a coppery, reddish-brown residue. Grey, lifeless leaf that gave you a weak cup was tired before it reached you.

Test 4: the float and grit test

For bulking, the crudest adulteration of all: something that is not tea, added to make up weight. Sand, soil, iron filings and sawdust have all been documented in loose unbranded tea.

Stir a spoon of tea into a glass of water and let it settle. Tea granules wet slowly and most will hover or sink gently. Sand and soil drop straight to the bottom and sit there as a distinct gritty layer you can see against the glass, separate from the tea.

For iron filings, run a magnet along the outside of a saucer of dry tea. Nothing should follow it.

You are unlikely to find any of this in a sealed branded pack. It is worth knowing if you buy loose from a sack.

What can these tests not tell you?

Being honest about the limits, because a test presented as more than it is becomes marketing itself.

None of these detects pesticide residue, heavy metals or microbial contamination. Those need a laboratory, and they are the reason an FSSAI licence number and a batch code on the pack are worth more than any kitchen test. Ours is on every pack; check that any brand you buy prints one.

None of them measures quality either. A tea can be entirely pure and still be a poor cup: thin, flat, over-dusted, wrong grade for milk chai. Purity is the floor, not the ceiling. Judging whether a tea is actually good is a separate exercise, and it happens in the cup.

What should you do if a pack fails?

Keep the pack, the batch code and the receipt. Complaints go to FSSAI through its Food Safety Connect portal or app, or straight to the Food Safety Officer for your area. The powers to sample, seize and prosecute sit with the state food safety administration: a Designated Officer for each district, and Food Safety Officers under them. A brand that has genuinely sold adulterated tea should be reported, not argued with in a comment section.

Quick reference

• Cold water test: colour that runs in two minutes was added. Real tea needs heat.
• Wet tissue test: clean tea barely marks the paper; dye stains it.
• Exhausted leaf: crumbles dry, smells of little, brews weak, leaves grey residue instead of coppery.
• Grit test: sand and soil settle as a separate layer. A magnet should pick up nothing.
• No kitchen test finds pesticides or metals. An FSSAI number and batch code on the pack matter more.
• Pure is not the same as good. Purity is the floor.
• Run all of it on our pack too. That is the point of publishing it.