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    Home » Chemical and Physical Methods of Glass Discoloration » Damping of Glass » Discolored and Translucent Glass » Glass - "Albino"

    Glass - "Albino"


    There are chemical and physical methods of glass discoloration. In the chemical method, they aim to transfer all the iron into Fe3 +. To do this, oxidizers are introduced into the mixture - alkali metal nitrates, cerium dioxide CeO2, as well as arsenic (III) oxide As2O3 and antimony (III) oxide Sb2O3. Chemically discolored glass is only slightly colored (due to Fe3+ ions) in a yellowish-greenish color, but it has good light transmission.
     
    Discolored and Translucent Glass
    Discolored and Translucent Glass 
    When physically bleaching, “dyes” are introduced into the glass composition, i.e. ions that paint it in additional tones to the color produced by iron ions. These are oxides of nickel, cobalt, rare earth elements, and also selenium. Manganese dioxide MnO2 has the properties of both chemical and physical bleaching. As a result of the double absorption of light, the glass becomes colorless, but it's light transmission decreases. Thus, it is necessary to distinguish translucent and discolored glass, since these concepts are different.


    Сlarified and Ordinary Glass
    Сlarified and Ordinary Glass
    Transparency is one of the most important properties of glass. However, in some cases, the glass is specially made opaque by its “damping”. This is the process by which glass becomes opaque. Substances that contribute to the clouding of glass are called silencers. The damping occurs due to the distribution of the smallest crystalline particles over the entire glass mass. They are undissolved silencer particles or particles precipitated from the liquid mass upon cooling the glass. These particles are usually transparent, but their index of refraction differs from the index of refraction of glass. Therefore, the beam incident on them deviates from the rectilinear direction and the glass ceases to be transparent. In the distant past, a bone meal containing calcium phosphate Ca3(PO4)2, as well as SnO tin, As2O3 arsenic, and Sb2O3 antimony oxides were used as glass silencers. Currently, cryolite Na3[AlF6], fluorspar CaF2 and other fluoride compounds are used for this purpose.

    Margaret
    Chemical and Physical Methods of Glass Discoloration Damping of Glass Discolored and Translucent Glass
    Friday, July 26, 2019

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