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    bologna phosphorus

    Quellen
    Collection of tiny mineral bottles. Manganese oxide: when dry, “a perfectly green powder”; sprinkled in water, it turns bright red. Bologna phosphorus: seen through yellow or red glasses, it’s a mild white powder; through violet or blue glasses, it goes luminous. This little collection should include a white saucer holding thickly ground carmine. To normal eyes, the powder looks pink, but spread thinly before red-blue colorblind eyes, it looks blue.
    Kommentar
    Hier geht es um Goethes Farbenlehre. Hab jetzt eine Weile recherchiert und finde das einfach nicht. Kann mir jemand sagen, wie dieses Mineral auf deutsch heißt.
    Schönen Sonntag.
    VerfasserIMKE20 Sep. 09, 13:03
    Kommentar
    Ich habe keine Ahnung, ob das wirklich passt, aber es fiel mir praktisch sofort in den Schoß:

    Berühmte Alchemisten waren z. B. Vincenzo Casciarolo aus Bologna, der 1604 erstmals einen Phosphoreszenz-Farbstoff herstellte, den sogenannten „Bologneser Leuchtstein” oder „Lapis Solaris”
    #1Verfasser Harald (dede) [de] (370386) 20 Sep. 09, 13:12
    VorschlagBariumsulfid
    #2VerfasserAngelika20 Sep. 09, 13:15
    Kommentar
    http://www.alchemywebsite.com/bologna.html
     
    The Bologna Phosphorus

    Around 1602, Vincenzo Casciorola of Bologna, discovered a translucent mineral in fields near Monte Paterna, some 4 miles from Bologna, which when calcined acquired the property of glowing in the dark after exposure to sunlight. Casciorola originally called it the 'lapis solaris' as it appeared to store the light of the Sun. An account was later published by Fortunio Liceti Litheosphorus, sive de lapide Bononiensi lucem, Utino,1640.
    This substance appears to be barium sulphide. It was made phosphorescent by being powdered very finely, calcined, then mixed with water or white of egg and fashioned into small tablets, which were again calcined at a high temperature in a furnace using bellows. It then was capable of phosphorescing after being exposed to sunlight. It was called the 'lapis illuminabilis' and attracted the interest of Athanasius Kircher.
    There were various kinds of this stone, some glowed like the embers of a fire, others with the characteristic blue flame of burning sulphur.
    #3Verfasser Harald (dede) [de] (370386) 20 Sep. 09, 13:21
     
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