Coffee purity test: FSSAI recommends 5-minute home test to check if your favourite blend is clay-free

Coffee is a daily essential for millions, but have you ever wondered if your favourite blend is truly pure? Food safety authorities have recently highlighted a simple home test to detect adulteration in coffee powder, especially the presence of clay, which often goes unnoticed.

With rising concerns around food quality, this quick method can help you ensure what you’re drinking is safe and authentic.

What Is Coffee Adulteration and Why Should You Care?

Coffee adulteration refers to the mixing of unwanted substances like clay, chicory in excess, or other fillers into coffee powder. This not only affects the taste and aroma but can also pose health risks over time.


Clay adulteration is particularly concerning because it may not be visible to the naked eye. That’s why a simple home test can make all the difference.

Simple Coffee Purity Test at Home

You don’t need any special equipment to check your coffee. Just follow these easy steps:

• Take a clean glass of water
• Add half a teaspoon of coffee powder into the glass
• Let it sit undisturbed for about 5 minutes

Now, observe the results carefully.

How to Identify Pure Coffee Powder?

If your coffee is pure and unadulterated:

• The powder will mostly float on the surface
• There will be little to no residue at the bottom
• The water may slightly change colour, but no heavy particles will settle

This indicates that your coffee is free from harmful adulterants like clay.

Signs of Adulterated Coffee Powder

If the coffee is adulterated, especially with clay:

• You will notice sediment settling at the bottom of the glass
• The water may appear cloudy or muddy
• The particles may sink quickly instead of floating

These are clear signs that the coffee may not be pure and could contain unwanted substances.

Why This 5-Minute Coffee Test Matters

This quick test is not just about taste, it’s about health and awareness. Regular consumption of adulterated food products can have long-term effects, making it important to stay vigilant.


Simple checks like this empower consumers to make informed choices and demand better quality products.

Choose Safe and Pure Coffee

Ensuring the purity of your coffee doesn’t have to be complicated. With just a glass of water and a few minutes, you can protect yourself from adulteration.

As awareness grows, more consumers are taking steps towards safer food habits. Next time you make your cup of coffee, take a moment to test its purity, you might be surprised by what you find.