scum'd

Boil fair water, and scum it, and to every quince so scum'd and boil'd, take six ounces of the blew of Violets, only shift them as before nine times, and the last time take nine ounces of Violets; let them stand between times of shifting twelve hours, keeing the liquor still on hot embers, that it may be but milk-warm; after the first shifting, you must stamp and strain your last nine ounces of

The Gentlewoman's Companion: or,%0AA Guide to the Female Sex 1675

This is further confirm'd by this observable, that that Iron or Steel will keep longer from rusting which is covered with this vitrify'd case: Thus also Lead will, by degrees, be all turn'd into a litharge; for that colour which covers the top being scum'd or shov'd aside, appears to be nothing else but a litharge or vitrify'd Lead.

Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon Robert Hooke 1669

704: Severing each kinde, and scum'd the Bullion dross:

Paradise Lost (1667) 1667