Colour Can Be Obtained

The Chemistry of Art > 1. Pigments in Painting > Colour Can Be Obtained >

Colour can be obtained through pigments spread on a surface layer (e.g. paints) or mixed with the bulk of material (e.g. glass colours)

  • Metal oxide pigments were used for painting were also used to colour glass

Method 1: Powdered Oxides

  • Oxides are finely powdered and are added to glass mixture before melting
  • Examples:
    • Cobalt oxide = Blue
    • Manganese oxide = Purple
    • Iron oxide = Green or bright yellow
    • Copper (II) oxide = Red

 Method 2: Staining

  • Glass is painted with silver nitrate then fired in oven
  • Yellow tones, ranging from pale yellow to deep orange indicates the number of times stained and fired