Adulteration is one of the most common problems with loose or unbranded turmeric powder sold in Indian markets. The most frequent additives are metanil yellow (an industrial dye, not approved for food use), starch, chalk powder, and lead chromate — all added to boost colour or bulk up weight cheaply.

The water test

Add a teaspoon of turmeric powder to a glass of water and let it sit without stirring. Pure turmeric settles slowly and leaves the water a light yellow. If the water turns intensely yellow or orange immediately, or if the powder dissolves into a streaky colour trail, that usually signals an added dye.

The touch test

Rub a pinch of the powder between your fingers. Pure turmeric feels slightly coarse and grainy, close to its natural fibrous texture. A powder that feels unusually smooth and slippery, closer to talcum powder, often has starch or chalk mixed in.

Check the colour under different light

Real turmeric has a warm, slightly muted golden-orange shade. Artificially dyed turmeric tends to look unnaturally bright or fluorescent, especially under white LED light, and the colour can look different again in daylight.

Why this matters

Beyond the obvious food-safety concern, adulteration also means you're paying turmeric prices for filler. It's also why curcumin content — the compound responsible for turmeric's real colour, aroma, and quality — varies so much between brands even when the price looks similar on the shelf.

At AGRREEN, every batch of turmeric is lab-tested for curcumin content before packaging, and that figure is listed on the product page rather than left as a marketing claim. If you're buying loose turmeric from an unfamiliar source, these three checks take under a minute and are worth doing before it goes into your spice box.