
A second, lead glaze added to tin-glaxed eartheware after decoration and firing. It was introduced on delft ware in the 17thC, to enhance the brightness of the colours and give a smooth, glassy finish. The idea was taken up by the British, at bristol for example, during the early 18thC, but with less striking results.
Found on
http://www.antique-marks.com/antique-terms-k.html

(from the article `pottery`) ...colours, the outline (known as trek) being first drawn with blue or manganese and then filled in. Before firing, the object was covered with an ...
Found on
http://www.britannica.com/eb/a-z/k/59

A second, lead glaze added to tin-glaxed eartheware after decoration and firing. It was introduced on delft ware in the 17thC, to enhance the brightness of the colours and give a smooth, glassy finish. The idea was taken up by the British, at bristol for example, during the early 18thC, but with less striking results.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.