Spices are the foundation of Indian cooking. They are also one of the most adulterated food categories in India. From the turmeric in your dal to the chilli powder in your curry, the spices on Indian kitchen shelves are routinely found to contain substances that have no business being in food — artificial dyes, heavy metals, sawdust, chalk powder, and more.
of spice samples tested by FSSAI in a national survey failed quality standards
higher adulteration rate in loose spices compared to branded packaged spices
dyes — industrial carcinogens — found in chilli and paprika samples across India
The most commonly adulterated spices in India
- Turmeric (haldi) — Adulterated with lead chromate (a yellow industrial pigment) to enhance colour. Lead chromate causes severe lead poisoning, kidney damage, and is a known carcinogen. Also adulterated with chalk powder and starch to increase weight.
- Red chilli powder — Adulterated with Sudan dyes (industrial azo dyes banned for food use), brick dust, and artificial red colours. Sudan dyes are carcinogenic and are also used as industrial solvents and dyes.
- Coriander powder (dhania) — Mixed with dried horse dung powder, sand, and other fillers. Colour adulterants used to improve appearance after dilution.
- Cumin (jeera) — Adulterated with grass seeds that look similar to jeera. Also found to contain charcoal dust applied to cheaper seeds to mimic the appearance of genuine cumin.
- Black pepper — Adulterated with papaya seeds, which look nearly identical. Also mixed with light berries that appear similar but have no flavour or nutritional value.
- Asafoetida (hing) — One of the most commonly adulterated spices. Genuine hing is expensive — it is routinely diluted with starch, resin, and cheaper gums to reduce cost.
The Sudan dye problem — why it matters
Sudan dyes are a family of synthetic azo dyes used industrially for colouring petroleum products, waxes, and shoe polish. They are banned for use in food in India, the EU, the US, and most countries due to their carcinogenic properties.
Yet they keep appearing in Indian spice samples — particularly red chilli powder and paprika — because they are cheap, intensely coloured, and visually indistinguishable from natural chilli pigments. Sudan I, II, III, and IV are all classified as possible human carcinogens by the IARC.
The lead chromate problem in turmeric: Lead chromate is used in some parts of India to give turmeric a brighter, more intense yellow colour. A study published in the journal Environmental Research found that turmeric adulteration with lead chromate was contributing significantly to elevated blood lead levels in Bangladesh — with implications for India's supply chains. There is no safe level of lead exposure for children.
Are branded spices safe?
Branded spices from major manufacturers are generally safer than loose spices — they have more robust quality control processes and face greater regulatory scrutiny. However, branded does not mean guaranteed. FSSAI has issued notices and recalls against major spice brands for quality violations including excessive pesticide residues, undeclared additives, and microbial contamination.
In 2024, several Indian spice brands faced bans in export markets including Singapore, Hong Kong, and Nepal after samples were found to exceed permissible limits for ethylene oxide — a fumigant used to extend shelf life that is classified as a carcinogen.
What a certified spice test checks
- Artificial colour screen — Tests for Sudan dyes (I, II, III, IV), Metanil Yellow, Rhodamine B, and other industrial dyes banned for food use.
- Heavy metals — Lead, chromium, arsenic, cadmium. Lead chromate adulteration in turmeric is detected here.
- Foreign matter & filth — Presence of non-food material including dust, sand, seeds of other plants, and animal matter.
- Moisture and ash content — High moisture indicates poor storage or adulteration with water. High ash content indicates mineral fillers like chalk or sand.
- Microbial count — Total plate count, yeast, mould, and pathogen screening. Poor hygiene during grinding and packaging leads to contamination.
- Pesticide residues — Spice crops are heavily treated — residues concentrate during the drying and grinding process.
The spices in your kitchen go into food that your entire family eats every day. For a category with this level of documented adulteration — including carcinogens and heavy metals — verification is not paranoia. It is prudence.