炭素或は炭素含有化合物による硝子の著色
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The following paper deals with the preliminary experiments on the coloration of glasses by carbon, which will be studied further on.The glasses which conform to the general molecular formula 1.3 R2′O, R″ O, 6SiO2 and 1.3 R2′ O, B2O3, 6SiO2, have been selected and the following two series of experiments have been carried out, the amount of the total batch being about 3.5kg.a) The glasses have been produced by melting the batch mixtures in which the ordinary graphite content lies between 0.1% and 0.5%.b) The glasses have been prepared from the raw batch mixtures into which 1% graphite and 1% oxidizing or reducing agents have been added respectively.The general conclusions which have been obtained from the results of the experiments stated just above are as follows.(1) Whne the component R″O in the glass is metallic oxide, the glass thus produced shows no colour, or even if coloured, it is very thin and weak.The glasses of the other composition showed the colouration varying from yellow to brown according to the amount of graphite added into the batch.(2) When the amount of graphite is too excess, the glass can not be coloured, the carbon being floated upon the molten glass or suspended in it rendering the glass greyish.(3) It has been found that the oxidizing power of nitre is not so effective, but that of arsenic is so powerful that the yellowish or brown colour of the glass which should be rendered by graphite has throughly faded away.The reducing action of the sugar is not so remarkable, but it has been seen that the sugar makes the glass colour somewhat deeper.
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