Technical Terms

Anisidine Value (AnV): AnV is measured by reacting the oil with a solution of p-anisidine in acetic acid, and measuring the increase in absorbance of light at a specific wavelength (350 nm).

Bleaching: The oil is mixed with a carefully measured quantity of diatomaceous earth, which absorbs the colour components from the oil. The process is a gentle one, and does not involve the use of chemical bleach, as is sometimes supposed! This process also removes metal ions, any residual chlorophyll and other components that may adversely affect the stability of the oil.

Cold Test: This test determines whether the oil remains clear and bright when subjected to low temperatures.

Colour Index: The colour of the oil is measured using a yellow/red scale specially developed for oils and fats by the American Oil Chemists