...Lomaméwater is black, and black scum comes up in it... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...The froth from their lips is then added tothe boiling mixture, and so soon as an oily scum rises to thesurface, the kabara-tel is complete...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...There was, however, on the surface,in parts, an exceedingly fine scum of pale yellow green,and this, armed with a teaspoon, we proceeded toattack...
Henry J. Slack 「Marvels of Pond-life」
...This water now has a greasylooking scum and a sour, unpleasant odor...
Gerard Fowke 「Archeological Investigations」
...When the hyposulphite of gold is used ingilding, it requires less heat and a longer application, as there is somedanger of producing a glossy scum over some parts of the surface of theplate...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...Sometimes the operator is troubled with streaks or scum on the plate...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...Is the mercury free from scum and dirt? If not, filter...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...There was also a red scum on the water, and some of it was taken up to be examined by Mr...
Matthew Flinders 「A Voyage to Terra Australis」
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