In-glaze
With the inglaze of porcelain , the colors are applied to the glaze coating of the already burned-out body . They are either applied evenly with a brush or sprayed on with a paint gun; in screen printing decorations produced are either flashed (decal) or pushed from the paper to the porcelain (slide picture). During the final decor firing , the colors sink into the softening glaze at high temperatures and are permanently protected against normal mechanical and chemical loads (acid resistance, alkali resistance, dishwasher resistance) through this close connection. In-glaze decorations are comparatively expensive and not suitable for decorations with sharp contours.
Sharp fire color
The decor should be permanently bonded to the porcelain body as resistant to liquids and mechanical wear as possible. This requires dyes that fuse with the body or glaze at relatively high temperatures or are part of the same. The hot-fire colors used here (also in-glaze colors or large-fire colors, stoving temperature 1350 ° C-1400 ° C) and the modern sink-in colors (stoving temperature 1200 ° C-1280 ° C) are glass fluxes that contain metal oxides with high burning stability as color pigments , e.g. B. antimony or ocher yellow, iron orange, cobalt blue, chrome or copper oxide green and manganese violet or red.
See also
literature
- Joseph Hoffmann: Technology of fine ceramics . Leipzig: VEB German publishing house for basic industry, 1987, 8th edition, ISBN 3-342-00169-0 .
- Bettina Schuster: Meissen. Stories about the past and present of Europe's oldest porcelain factory . Munich: Orbis Verlag, 1996, ISBN 3-572-00811-5 .
- Günther Sterba: Utility porcelain from Meissen . Edition Leipzig, 1988, ISBN 3-361-00193-5 .