...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」
...Are the buff s dry and clean? Examine the plate critically afterbuffing to detect any appearance of scum or film on the surface...
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」
...They halted, greatly surprised, and turned in their saddles and looked back, as if wondering if it might be worth while to bother with such scum as we...
Mark Twain (Samuel Clemens) 「A Connecticut Yankee in King Arthur’s Court, Complete」
...Not till it begins to scum over will it beperceptibly cooler...
Oliver Lodge 「Pioneers of Science」
...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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