South Island stoneware clay body with fine Matukituki River gravel inclusions, glazed with a Chun glaze, fired to cone 10 in reduction

The blue of a Chun glaze is due to the scattering of light due to bubbles captured within the structure of the glass.  The characteristic colour of South Island glacial lakes such as Lakes Pukaki and Tekapo is produced by light being reflected from suspended fine rock particles or ‘flour’ formed through the action of glaciers.

Although the origins of these optical illusions differ, they both result in the perception of a brilliant opaque blue (or mixture of blues) having a similar quality.

The Chun glaze also reacts with the iron-containing river gravel,which itself was created through glacial action, to produce rivulets and eddies on the vessel surface.