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The title, Mappae clavicula, is absurd, translating approximately as 'the little key to the small cloth'. The best explanation is that it is a mis-translation from a Greek original, in which χειρόκμητον kheirókmēton ('knack' or 'trick of the trade') was mis-read as χειρόμακτρον kheirómaktron ('hand-towel'). [ 5 ]
Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass. When used together with cadmium sulfide, [9] it yields a brilliant red color known as "Selenium Ruby".
The 2 next to my room number on the dining log at the hostess stand was scratched out and replaced by a small 1. As I was seated at my table, the second place setting was whisked away.
The treatise includes many glass formulations that were devised by Neri by improving on formulations that he became aware of through his work in the Medici court, through his interactions with Ximenez, and likely other sources. [1] [2] The contents of L'Arte Vetraria volume-by-volume are: [5] Basic glass colours and preparation; Chalcedony glass
The B 2 O 3 content for borosilicate glass is typically 12–13% and the SiO 2 content over 80%. High chemical durability and low thermal expansion (3.3 × 10 −6 K −1) – the lowest of all commercial glasses for large-scale technical applications – make this a versatile glass material. High-grade borosilicate flat glasses are used in a ...
Alchemy was a series of practices that combined philosophical, magical, and chemical experimentation. One goal of European alchemists was to create what was known as the Philosopher’s Stone , a substance that when heated and combined with a non precious metal like copper or iron (known as the “base”) would turn into gold.
Like alchemy in visual art, the intersection of alchemy and literature can be broken down into four categories: The alchemical texts themselves; Satirical attacks on alchemists; Stories that incorporate alchemical iconography; and; Works that are structurally alchemical, known as literary alchemy. In the first category are the writings of ...
An alembic (from Arabic: الإنبيق, romanized: al-inbīq, originating from Ancient Greek: ἄμβιξ, romanized: ambix, 'cup, beaker') [1] [2] [3] is an alchemical still consisting of two vessels connected by a tube, used for distillation of liquids.