This that the "B" vitamine is not only soluble in water, but also olive oil and in Oleic acid.
"The Vitamine Manual"
Walter H. Eddy
In this way the soft Oleic acid is squeezed out, whilst the hard palmitic and stearic acids remain.
"The Chemical History Of A Candle"
Michael Faraday
3 and 4 are made from the Oleic acid of the candle factories, and the unsaponifiable matter is due to their containing mineral oil which has been added to them.
"The Dyeing of Woollen Fabrics"
Franklin Beech