page_title: Milk glass
section_title: Principle
hierarchical_section_title: Milk glass / Principle
caption_attribution_description: English: a piece of blue glass, through which the light shines orange, seeming to behave like the sky at sunset. There is a long commentary on why the sky is blue.
context_page_description: Milk glass is an opaque or translucent, milk white or colored glass that can be blown or pressed into a wide variety of shapes. First made in Venice in the 16th century, colors include blue, pink, yellow, brown, black, and the eponymous white.
context_section_description: Milk glass contains dispersion of particles with refractive index significantly different from the glass matrix, which scatter light by the Tyndall scattering mechanism. The size distribution and density of the particles control the overall effect, which may range from mild opalization to opaque white. Some glasses are somewhat more blue from the side, and somewhat red-orange in pass-through light.
  The particles are produced via addition of opacifiers to the melt. Some opacifiers can be insoluble and only dispersed in the melt. Others are added as precursors and react in the melt, or dissolve in the molten glass and then precipitate as crystals on cooling; this is similar to color production in striking glasses, but the particles are much bigger.
  The opacifiers can be e.g. bone ash, or tin dioxide and arsenic and antimony compounds. They are also added to ceramic glazes, which can be chemically considered to be a specific kind of milk glass.
caption: The Tyndall effect in opalescent glass: It appears blue from the side, but orange light shines through.[1]
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