It is true that crystal does not tolerate extreme temperatures well at all. But, they are not referring to the temperature is is stored at.
Stemware should always be stored upright (standing on its foot) to help prevent chipping the rims. Be sure to allow enough room between each glass to avoid touching - this will help prevent chipping on the rims.
To prevent cracking or breaking caused by extreme temperatures do not pour cold liquids into crystal that has just been washed in hot water and always allow chilled crystal to reach room temperature before washing. - Never put lead crystal items in the microwave as it can damage the crystal as well as the microwave.
So, botttom line is that switch from one extreme TO the other is what can break or crack them. One continuous temperature in storage, even if very cold, will not harm them. If you took them from that extreme cold and dropped them in very hot water, THAT COULD CRACK THEM. You bring them from one temperature to the other, slowly, if you ever even have a situation like that.
- Response by randyl
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