How can I tell if something is glass or crystal, without any maker marks, receipts, tags, or anything else that might have this information? Is it possible to determine which it is without looking through a microscope or taking it to an expert?
I have a theory. I was cleaning a decanter and wine glasses the other day and when my wet finger rubbed around the edge of one of the glasses, it made such a beautiful sound. This made me think it was crystal. However, I don't know if glass will do the same thing when rubbed with a wet finger, I haven't got any long stem regular glasses to compare them to.
Can anyone tell me if this "sound test" is just a myth, or if this is a good sign that it's actual crystal?
I have looked through guides about this and some attributes make me think it's crystal and some make me think otherwise. Example; The glasses do make a "ping" sound instead of a "thud" when the edge is tapped. I can hold them up to light and don't see a green, yellow, or gray hue to them, but at the same time I do not see any prism effect or brilliant colors shining through either. The edges don't feel sharp as the guides say glass would feel, nor does the etching. They are thinner than most regular glasses I've seen but they don't seem to weigh more than expected as would lead crystal.
I'm just not sure about how to tell! Does anyone have any input on this? Help!