7 Signs of Adulterated Shea Butter

Saponification value and refractive index are set by the triglyceride make-up of the fat. A foreign fat or mineral oil shifts them; refining does not move them, so an out-of-range value is an identity signal, not a process fault. Paraffin or mineral oil is commonly described as lowering saponification value sharply; some vegetable fats shift refractive index. Read both lines together on the batch certificate and compare them with the identity ranges on the specification pages. The COA interpreter flags a pair that sits outside the published shea band so you know which lab question to ask next.

Shea’s unsaponifiable fraction is high compared with most vegetable fats in the published literature. Dilution with a low-unsaponifiable fat drags the figure down; heavy refining lowers it a little, dilution lowers it a lot. A supplier who omits unsaponifiables from the certificate is often not testing the line — ask for it, or send a retain to a fats-and-oils lab. Pair an unusually low result with saponification value and refractive index before you treat it as proof; the four identity lines together are stronger than any one. Confirm the method on the unsaponifiable-matter specification page.

Unrefined shea is ivory to pale yellow with batch variation. A bright white or perfectly uniform “unrefined” lot has either been refined and bleached — in which case it is mislabelled — or cut with a white fat or wax. Colour alone never proves adulteration; it decides which laboratory test to run next. White, odourless butter can be honest refined N-RBD. The problem is an unrefined claim on a refined-looking lot. Check colour grading, run the grade checker, and read the grades page before you treat shade as a verdict.

Unrefined Grade A has a mild nutty, sometimes smoky note. No odour at all on an unrefined claim, a paraffin or candle note, or a strong rancid note on a “fresh” claim are mismatches. Odour tracks free fatty acid and peroxide value, so pair the nose with those certificate lines rather than judging by smell alone. A refined N-RBD lot should be nearly odourless; that is process, not proof of purity. Use the grade checker to see whether the sensory story matches the numbers, then confirm FFA and peroxide value on the specification pages.

Shea softens over a range rather than melting sharply. A lot that melts like a wax, stays hard at skin temperature, feels waxy or tacky, or separates into an oily layer over a hard residue suggests a foreign fat or wax. Graininess on its own is usually polymorphism after heat cycling, not adulteration — it reverses when the fat is fully melted and cooled quickly. Do not treat grains as a fake-shea test. Confirm slip melting point and iodine value; a melt that does not match shea, or an iodine value off the identity band, is the laboratory follow-up.

Grade A unrefined has a floor set by kernel price, yield and cooperative payments. A quote far below the range of several suppliers for the same grade, Incoterm and volume is a signal to test before paying, not a bargain. EMI does not publish prices. Collect at least three offers on the same basis, then ask for a batch certificate and identity tests before a deposit. The supplier-questions list covers how to ask for those numbers without accepting a vague “market price”. Run the certificate through the COA interpreter before you treat a cheap offer as equivalent butter.

A “typical values” sheet, an unsigned document, or a certificate without saponification value, refractive index or unsaponifiables removes the buyer’s ability to check identity at all. Treat that lot as unverified. Ask for the batch certificate first, then a retained sample, then a third-party test if the value of the order is large. Free fatty acid and moisture alone cannot prove authenticity — a diluted lot can still pass an acidity test. The sample certificate page shows what a method-referenced report looks like; the COA guide is the reading checklist.