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Crockery is exposed to many influences in the dishwasher. The omposition of the detergent, the temperature of the machine, the degree of water hardness and the method of drying, all this determines the durability of the items.Some of the older machines do not protect the articles as well as new ones. It is important to follow the guidelines issued by the manu- facturer e.g. to regularly refill the salt storage container and to follow the dosage recommen- dations for detergents. Dishwashers that do not automatically disperse the heat should be opened immediately after the rinsing cycle is finished. Most damage is done during loading or unloading of the dishwasher. The crockery must be placed in such a way that it does not touch or rub. For dishwasher use we divide the patterns into three groups: we make a distinction between precious-, dishwasher suitable- and dishwasher safe patterns.
The appearance of the decoration - the art design - is the predominant feature of the porcelain. Dishwasher suitability is not the first consideration. Use of precious colours and their subtle realisation do not allow dishwasher rinsing. This decoration was tested by the Institute for Material Technology (IWT) of Rosenthal GmbH. The service must always be washed by hand.
The colours of this pattern are fired onto the glaze at (at least) 840 degrees C. These resistant colours achieve such a strong bond with the glaze that the dishwasher has little or no affect on the decoration. Dishwasher tests in the Institute for Material Technology (IWT) at Rosenthal GmbH have proved good durability of the pattern. The service can be put into the dishwasher at a maximum of 55 degrees C. Do pay attention to the guidelines of manufacturers of dish- washers and detergents on the suitability of their products.
The colours of the decoration are melted into the glaze at a temperature of over 1000 degrees C, where the glaze softens and absorbs the decoration. Its colours and luminescence then becomes indestructible , scratch and rub resistant. However, gold decors are not totally insensitive to scratches due to their natural material characteristics. The pattern has been tested by the Institute for Material Technology (IWT). It can be placed into the dishwasher without reservation. To limit the production to decorations rated as "dishwasher safe" would be an exaggerated precaution. Decorations that are suitable for the dishwasher also have a satisfactory life span; they permit more colourful, artistically versatile designs.