Screening Natural Colours for Adulteration: Certasure™ Food Safety Program in Action

Food Safety Heightens to an All Time High Although food safety in the European Union has become strictly observed since the implementation of basic food regulation in 2002 along with local regulations, such as the German Food and Feed Code (LFGB), foodborne illnesses still occur each year. On average there is about 5.000 reported outbreaks involving more than 40.000 individuals, the European Union reports in the 2018 Zoonoses Report. Whilst the Rapid Alert System for Food and Feed (RASFF) is in place to ensure a swift reaction to incidences in which the public health is at risk, Sensient fully supports promoting this transparency at an ingredient level. Sensient’s Certasure program ensures that all of our colouring from natural sources and formulation with natural raw materials are safe and free of adulterated substances and other contaminates. In fact, in early 2020, one of our global Sensient sites rejected a shipment of red cabbage due to adulteration. Through this screening process, we detected contamination of two lots of red cabbage with purple sweet potato. Analytical testing of the suspect lots compared with standard colour sources indicated components not commonly found in red cabbage but typically characteristic of purple sweet potato. This shipment was rejected as contaminated and returned to the vendor, a perfect example of exactly why a robust food safety program like Certasure™ is needed. This blog is part of an ongoing series sharing details about each of our robust screening processes. Click one of the links below to find out more:



Heavy Metals


Microbiological Contamination




Unauthorized Solvents

Our Certasure Adulteration Screening Process

Sensient’s adulteration screening process ensures all of our incoming natural raw materials are free from contaminants like synthetic dyes or other additives that adulterate the product.

There is a zero-tolerance policy for adulterants.

Our oversight on adulteration of natural materials is extremely vigilant, as Sensient is on the RASFF’s notification list to be amongst the first to hear if an adulterant is flagged by a raw material vendor globally. In our first screening blog, we discussed our use of HorizonScan, which is an important tool for us to stay up to date on current risk matrixes and remain aware of potentially relevant global environmental events that could impact food safety.

Two Ways Adulteration Occurs In Supply Chains


Adulteration may occur maliciously or for economic gain, whether to dilute a raw material so it can be “stretched” further or to increase its weight or volume to inflate pricing. Check out this video to see an example of how we helped a leading beverage brand identify a case of intentional adulteration.


It would be much more likely for adulteration to occur by accident. Natural raw materials absorb things indiscriminately from the air, water, and soil around them. If the groundwater or soil in a field has been contaminated, that will get into the crop. This issue can be further exacerbated by the concentration process that many crops go through in order to extract the natural colour.
Sensient’s global agronomy program helps to ensure our partner farmers remain very attentive to potential food safety risks, and the Seed-to-Shelf strategy enables us to have full traceability on our vertically integrated botanical crops for colour.

In teaching farmers about potential situations resulting in accidental adulteration, we highlight these scenarios:

machine_green_icon Using the same equipment for harvesting multiple crops:

If the same equipment is used to harvest beets first and then black carrots, without proper attention and cleaning, colour/chemicals from the first crop could contaminate the second.

spray_tan_icon Spraying pesticides in a nearby field:

The wind may carry pesticides through the air across multiple fields, contaminating a colour crop unintentionally.

farm_peach_icon Storing or transporting crops in facilities where they may mix:

If two grain-based crops are stored in close proximity, for example in an open warehouse, air currents might stir up lightweight particles from one and contaminate the other.

Action Plan for the Presence of Adulteration As with all failures of any stage of the Certasure screening process, Sensient rejects and returns the raw material to its respective vendor. We rarely fail a raw material due to adulteration, and we have never seen a vendor knowingly adulterate one of ourcomputer_art incoming raw materials. We do see cross-contamination of pesticides and other environmental factors. However, we remain alert and cautious. Even vendors with a spotless record are screened with rigor to ensure that we never miss an instance of adulteration or contamination.

Our Certasure™ Promise to Youcertasure When you receive a natural colouring shipment from Sensient, you’ll see the Certasure™ shield on each product container — this is representative of our promise and guarantee of authenticity. You can rest assured that Sensient’s natural colouring will certainly not contribute to a recall or a consumer’s foodborne illness, thanks to the robust Certasure™ screening protocols in place. Sensient encourages our customers to always inquire about the implemented food safety protocols of all of their suppliers, of course including ourselves.

If you have any questions about the safety of your natural colouring, please feel free to reach out and schedule a consultation with one of our quality and regulatory experts.
If you’re ready to formulate with natural colouring that makes you confident, request a sample today!
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