LGSD239416 INTENSIVE YELLOW
The following is reprinted from Laguna’s press release
which was obviously written by a Chemist………………
The Degussa line of pigments (CAS-No.
10218409502) consist of Zirconium Silicate incorporating Cadmium Sulphoselenide
crystals . If the surface of the glaze is damaged, this coat (of zirconium) will
prevent a release of the cadmium pigment. Traditional ceramic cadmium glazes
contain Cadmium Sulphoselenide crystals incorporated as a pigment which are on
the surface of the ceramic body. If such a glazed surface is damaged, crystals
can be released along with cadmium.
The goal of Degussa’s Research and Development
Department when developing the inclusion pigments was to minimize the negative
appearance of cadmium release. In comparison to the traditional glazes, the
inclusion pigment glazes contain considerably less cadmium, namely approximately
0.15% Cd which is approximately 1/30 of the Cd content of traditional Cd glazes.
In the past, stable red stains at high firing
temperatures were unknown to the ceramic industry. This gap was bridged by the
inclusion pigments which are stable up to a firing temperature of 2372 degrees F
and are resistant to unfavorable kiln atmospheres.
By using inclusion pigments in glazes the
following additional advantages can be achieved in comparison to the traditional
- Favorable thermal expansion.
- Low sensitivity to contamination during mixing.
- Low influence of contamination by the bisque.
- Possibility of blending with other stains,
color oxides, and color frits.
- Compatibility with other glazes.
- Matting possibility with the addition of zinc
- Non-problematic behavior during processing of
The red, orange and yellow inclusion pigments can
be mixed with other and blended with other colors to make new colors.