Turquoise glaze in ceramics is also called
peacock-green or peacock-blue and quite often
the glazing is characterised by a type of crackle
or crazing which is known as "crackled ice" or
"fish roe" crackle.
The turquoise glaze owes its color to copper
oxide in an alkaline glaze mix.
The use of turquoise glaze goes back a long time
in the history of Chinese ceramics, at least as
early as the Tang dynasty. The interest for this
particular colour seems to have started and to
have been shared with Middle Easter potters
though the methods employed as to arrive at
similar results were quite different.
In addition, the technology available also differed,
depending on what material the glaze were to be
applied on to.
One of the curiosities of the ways that Chinese
potters used the material was that saltpetre
(potassium nitrate) was often used totally
unfitted, although it is essentially a soluble
material. The saltpeter was simply mixed with
quartz and water (and sometimes with lead
oxides or carbonates) to create such low-