Digitalfire Ceramic Glossary

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Opacifier, Opacification


A glaze additive that transforms an otherwise transparent glaze into an opaque one. Common opacifiers are tin oxide and zircon compounds. Opacifiers typically work by simply not dissolving into the melt, the white suspended particles reflect the light. However another mechanism of opacity is crystallization, this can occur when a crystallizing ingredient is super saturated into the mix (e.g. TiO2) or when slow cooling a glaze to encourage crystallization of less saturated oxides that crystallize easily (e.g. boron blue).

Out Bound Links

  • (Materials) Tin Oxide - SnO2

    Stannic Oxide, Tin(IV) Oxide, Tin Dioxide, SnO2

  • (Glossary) Boron Blue

    The blue haze in a transparent boron glaze that re...

  • (Glossary) Opacity

    Ceramic glaze opacity refers to the degree to whic...

In Bound Links

  • (Materials) Titanium Dioxide - TiO2 - Anatase, Brookite

    TiO2

  • (Typecodes) 1: OPA - Opacifier
  • (Project) Ceramic Properties

    A property in this context is a created physical p...

  • (Properties) Glaze Variegation

    In contrast to the typical homogeneous surfaces of...

  • (Properties) Glaze Opacifier

    Glaze opacity can be achieved using a number of di...

  • (Glossary) Colorant

    A material that transforms a glossy or white glaze...

  • (Glossary) Transparent Glazes

    A fully transparent glaze is simply one that does ...


Pictures
Flow tester demonstrates how zircon opacifys and stiffens a glaze melt


An example of what 5% tin oxide does in a transparent boron cone 6 glaze (G2884) on a dark firing clay body


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