Every production lot of fry oil is sent to an independent laboratory and checked against the Codex Alimentarius reference ranges for avocado oil.
A monounsaturated fat avocado oil carries in unusually high amounts. Most seed oils have almost none, so a reading under 1% points to dilution.
A saturated fat that avocado oil keeps low. Above range suggests a harder fat such as palm or tallow was blended in.
The omega-6 that dominates seed oils. Above range means soybean, corn or conventional sunflower was blended in.
The main plant sterol in avocado oil and the backbone of its sterol fingerprint. Below range means another oil's sterols are crowding it out.
Present in avocado oil only in small amounts. Soybean oil runs far higher, so an elevated reading is an early sign of a soy blend.
A sterol essentially unique to the canola family. Real avocado oil has little to none. Less than 0.5% is considered a trace level related to the testing.
Where the green comes from. The green bands are the acceptance ranges in Codex CXS 210 (2024), the international standard for named vegetable oils, for avocado oil. Natural variation between groves and seasons is already inside these bands. The orange dot is this lot's laboratory result.
Tying the fatty acids back to the lab report. The laboratory reports each fatty acid as a percentage of sample weight. Codex compares on a percentage of total fatty acids basis, so the figures on the cards are converted to that basis. For lot 90695 the laboratory reported palmitoleic 4.39%, stearic 1.01% and linoleic 10.72% by sample weight, which convert to the 4.81%, 1.11% and 11.75% shown on the cards. C16:1 and C18:2 use total-isomer results.
Sterols. Sterol values are shown exactly as the laboratory reported them, as percentages of total sterols, which is already the Codex basis. Brassicasterol is essentially unique to the canola family; a reading at or near ND (not detected) rules out canola blending.
Hatched bands show where common, cheaper substitute oils land on the same scale, for comparison. They are typical values from Codex CXS 210 and published oil composition tables, not acceptance limits.