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Impurum alcali
Salts solvents and liquid preparations · A Chymical Dictionary
At a Glance
The word. A residue distinguished through the purification of alkali.
In the book. Alcali is salt extracted from ashes or calx by boiling in lye.
A place to read. The historical definition below, 1650 dictionary, unnumbered definition page 27; facsimile PDF page 355.
Historical Definition
Impurum alcali is the scum removed from alkali when it is purified.
Meaning
The entry names what is taken away, rather than the purified alkali. Its identity is relative to that operation and its subject. The dictionary does not give a separate composition or a preparation under this name.
Use in the Book
Alcali is salt extracted from ashes or calx by boiling in lye. Extractum concerns what is taken from a bodily concretion while grossness remains behind. Those entries help a reader follow which portion is named at a stage of work. Impurum alcali specifically identifies the removed scum in this purification account.
Places to Read
Alcali. Salt defined through extraction from ash or calx.
Extractum. A selected product distinguished from bodily concretion and its gross remainder.
Historical source: 1650 dictionary, unnumbered definition page 27; facsimile PDF page 355 — Facsimile