saponaceous

Wons puts them through a microphone in a voice hushed, saponaceous, insinuatingly folksy, with an ingratiating "Are yuh listenin'?" or "Isn't that pretty?"

From Time Magazine Archive

The saliva is a saponaceous liquor, destitute of taste or smell, which is squeezed out from these glands, and mixed with the food during mastication.

From Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease by Thomas Garnett

It is a soft, saponaceous substance, not unpleasant to the taste, of a bluish color, and melts in the mouth, like the fat of cold meat, leaving the palate greasy.

From The Poor Scholar Traits And Stories Of The Irish Peasantry, The Works of William Carleton, Volume Three by William Carleton

The yolk being a saponaceous compound, and not an oily matter as is generally supposed, it readily combines with the water and passes out of the wool.

From Domestic Animals History and description of the horse, mule, cattle, sheep, swine, poultry and farm dogs; with directions for their management, breeding, crossing, rearing, feeding, and preparation for a profitable market; also their diseases and remedies. Together with full directions for the management of the dairy. by Richard L. Allen

Will this be the case with saponaceous oils?

From Blackwood's Edinburgh Magazine, Volume 57, No. 357, June, 1845 by Various