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Everyone knows that glass can break. However, it is not widely known that water in combination with the carbon dioxide in the air can destroy the surface of a glass.
Water releases the alkaline properties from the outer surface of the glass which then combine with the carbon dioxide in the air to form a potassium carbonate - kali - that turns the glass milky white. This cloudy tarnish can be wiped off initially but it can return
time and again and eventually destroy the glass surface. The glass turns "blind".
Glass should therefore always be stored in dry places and not remain packaged for too long because the packing material retains dampness and, at the same time, keeps out the
A progressive destruction of the glass surface leads the glass to become iridescent, as we know from glasses that have been buried in the ground for a long period of time.
To a large extent, valuable lead crystal is immune from this.
Similar guidelines are applied to the cleaning of glass as to the cleaning of porcelain.
In the dishwasher glass should not be washed at a temperature hotter than 60 degrees C, using the mildest detergents. Glasses should be stacked in such a way that they cannot touch or rub against each other.
Precious glasses with gold or platinum decorations must be hand washed only. For lead crystal and thick glass the soapy water has to be lukewarm.
Never put two or more glasses in the same bowl when washing up, they can be scratched.
Never let water or soapsuds dry onto the glass but dry immediately.
Older dishwasher models, which do not let the steam evaporate automatically, should be opened immediately after the rinsing cycle has finished. Any type of steam can
damage the articles in the dishwasher, therefore also porcelain and cutlery.
It is recommended that glass is not subjected to strong temperature changes, particularly too hot or too cold. A gradual change of temperature will protect the glass.