From the book
A Chymical Dictionary
Gerhard Dorn and John French · Diotimos Editions · 2026
Browse this book’s lexicon →Orientation
At a Glance
- The wordA vitriol oil distinguished by its red colour.
- In the bookColcothar is calcined vitriol or the residue of oil of vitriol; Sal Calcotharinum is a salt made from Colcothar.
- A place to readThe historical definition below, 1650 dictionary, unnumbered definition page 36; facsimile PDF page 364.
Historical definition
Oleum Calcotharinum is red oil of vitriol.
Meaning
The material-name and colour provide the equivalent. The definition does not state a procedure, a source of vitriol or the composition of the resulting oil.
Use in the book
Colcothar is calcined vitriol or the residue of oil of vitriol; Sal Calcotharinum is a salt made from Colcothar. These related names should be followed through their particular products—oil, residue and salt—rather than treated as interchangeable merely because their forms resemble one another.
Places to read
- Oleum CalcotharinumRead the complete historical definition and its commentary.
- ColcotharVitriol named through calcination or through the residue of its oil.
- Sal CalcotharinumA salt derived from vitriolic colcothar.
Source note
Historical source. 1650 dictionary, unnumbered definition page 36; facsimile PDF page 364 — Facsimile
Sources. A Chymical Dictionary 1650, 1650 dictionary, facsimile PDF page 364, Oleum Calcotharinum