Can paprika and chilli powder be “too red”?

In 2016 an inspector from the New York State (NYS), Department of Agriculture and Markets visited a food market looking for suspicious spices. There had been a spate of adulteration incidents with paprika and related spices such as chilli powder and curry powder internationally and the New York authorities were surveying local supplies.

The inspector was Audrey, a colleague of Tom Tarantelli, now retired. Tom recently sent me an intriguing photograph of some products from the same brand that Audrey spotted that day.

In one store, Audrey noticed some packages of paprika that looked “too red”. This was, perhaps, a sign the paprika had been adulterated with unauthorised colourants.

She purchased the paprika and took it back to the lab for testing.  It was, indeed adulterated. Tom told me they found 2,400 ppm Sudan 4 and 850 ppm Sudan 1 in the product. It was one of the highest concentrations of Sudan 4 ever found, as high as the worst European case that had been reported up to that time.

The results were so remarkable that Tom purchased more packages to keep. “Realizing this product would be thrown away, I went to the store and obtained more. Such a great sample!” Tom told me.

That was in 2016, eight years ago.  Today, the products Tarantelli purchased are still a brightly-hued, fresh-looking red.

The photograph above was taken just a few months ago, more than seven years after the samples were purchased. The colour is bright. Pure paprika, on the other hand, loses its red colour over time and ages to a dull brownish colour.

This is the challenge for spice traders: old paprika doesn’t have an attractive colour. Dull-coloured paprika is perceived to be of lower quality and to have less flavour, and therefore must be sold for a lower price.

One solution is for traders to add colouring agents to their wares. Since pure spices are not allowed to contain even food-grade colourants, the traders do not bother to use colourants that are safe or legal. Instead, they use colourants that are cheap, easy to obtain and easy to handle.

Sudan dyes seem to be popular with unethical spice traders who want to enhance the colour of the spices they sell. The dyes are industrial colouring agents, much cheaper than food-grade colours, and sold for use in industrial oils, waxes and shoe polish. Sudan I has an orange colour and  Sudan IV is a blueish red. Sudan dyes have been found in paprika, chilli powder and curry powder many times over the past decade. They are also a common adulterant in unrefined palm oil, which has a bright red colour when fresh.

Sudan dye adulteration was first detected in food in 2003, and was the cause of a huge recall in the United Kingdom in 2005, which affected 570 foods. Alerts and notifications for Sudan dye contamination continue to this day. Last month Italian authorities rejected palm oil from Ivory Coast because it contained Sudan 3 and Sudan 4 dyes and German authorities recalled cheddar cheese powder from Syria which contained multiple Sudan dyes.

There were 39 notifications for Sudan dyes in foods between 2014 and 2024 in the European Rapid Alert System for Food and Feed (RASFF), and 12 in the US FDA Import Alerts records. Many of the alerts are for adulterated palm oil, but in Europe, paprika, seasoning and spice blends, barbeque rub, chilli pepper, sumac and sweet and sour sauce were also affected. In America, barbeque flavoured snacks were affected in addition to palm oil.

The incident in 2016 wasn’t the only time Tarantelli and his colleagues found Sudan dyes in spices. In fact, they found sixteen commercially available spices containing such dyes in less than two years. The spices included turmeric, curry powder, malathy and chilli powder in addition to paprika.

The New York State inspectors reported their results to the US FDA, prompting a series of recalls. Unfortunately, the recalls were classed as less serious Class 2 recalls because of the assumption that spices like paprika are consumed in only small quantities.

However, as Tarantelli pointed out in an article he wrote in Food Safety Tech in 2017, assumptions about serving sizes can be wrong. In fact, when he compared the amount of spice consumed by some ethnic groups to the reference serving size used by the FDA they were 20 times higher.

“In the Code of Federal Regulations (CFR) Title 21, the serving size per meal for spice is referenced as ½ gram. However, certain ethnic groups may consume a daily amount of 20 grams of spice per person.”

Takeaways for food safety professionals

• Foods that appear fresher, tastier or of better quality when their colour is more intense are vulnerable to adulteration with undeclared colourants.
• Red-coloured foods such as paprika, chilli powder and palm kernel oil are sometimes adulterated with Sudan dyes to enhance their colour and increase their apparent value.
• Sudan dyes are not approved for use in food, they are industrial dyes with carcinogenic properties.
• Despite a long history of recalls, safety alerts and import alerts for Sudan dye adulteration, food fraud perpetrators continue to adulterate foods with this dangerous group of chemicals.
• Although some food regulators consider adulterated spices to present a lower risk to consumers than other foods, because many people consume them in small amounts, some sectors of the population consume significant quantities of spices and are therefore at higher risk.
• Food businesses that purchase red-coloured foods including spices and unrefined palm oil should consider such foods vulnerable to Sudan dye adulteration, and implement mitigations.

Main sources:

Castell, A., Arroyo-Manzanares, N., López-García, I., Zapata, F. and Viñas, P. (2024). Authentication strategy for paprika analysis according to geographical origin and study of adulteration using near infrared spectroscopy and chemometric approaches. Food control, 161, pp.110397–110397. doi:https://doi.org/10.1016/j.foodcont.2024.110397.

‌Tarantelli, T (2024), correspondence with author.

Tarantelli, T. (2017). Adulteration with Sudan Dye Has Triggered Several Spice Recalls. [online] FoodSafetyTech. Available at: https://foodsafetytech.com/feature_article/adulteration-sudan-dye-triggered-several-spice-recalls/.

‌There are ‘protected origin’ paprikas in Europe (more correctly known as Protected Designation of Origin (PDO)).  These protected paprikas are from specific regions and are known for their unique regional characteristics.  For example, there is a special paprika from a certain part of Spain called Pimentón de La Vera and one from Hungary called Kalocsai fűszerpaprika-őrlemény.  Source: Castell et al (2024)