crystal – podictionary 544
Transcript:
If I tell you that the water in a lake is “crystal clear” you’re likely to equate the clarity to that of a wine glass made of expensive crystal. But it is more from the lake than from the glass that crystal grew.
The first citations in English for the word crystal were circa the year 1000. Even though this predates the Norman invasion it is thought that English got the word from Old French, which in turn got it from Latin, where in turn it came from Greek. There are also likely Indo-European roots that relate crystal to our word crust.
Here’s how that would work. The Indo-European parent, or great-great-grand-parent of both words meant something that was “freezing over.” It’s easy enough to see how that might relate to crust; as wet snow re-freezes it forms a crust. The Greeks used a similar word to mean frost and snow; krustallos. By the time crystal turns up in English 1000 years ago it holds both the meanings of “ice” and also of “crystalline rocks” particularly those that are transparent like ice. It’s thought that it was the Greeks who used the ice metaphor of krustallos for minerals, and we continue to do it when we call a diamond ring ice.
The first time glassware was called crystal was during Shakespeare’s time about 400 years ago, but what we think of as fine crystal hadn’t yet been invented. In the mid 1600s English glass-makers were fed up with foreign competition and they hired George Ravenscroft to see if he could figure out how to make good glass with materials found inside the British Isles. He experimented with adding flint to the glass with good results but it seemed over time the glass would lose its clarity, so then he hit on the idea of adding lead.
Who’d have thought that a glass made up of something like one third lead by weight would appear more clear than glass without lead. The key is that the lead changes the refractive index of glass making it sparkle more. As well, all that lead makes glass easier to cut, which is why you see all those cut glass patterns on expensive glassware, which in turn makes the glass sparkle even more.
George made a lot of money and his patents conveniently ran out just about the time he died. The problem, we now know, is that lead isn’t very good for you when you eat it and experts these days recommend that you don’t store liquids in lead crystal containers, or even drink from them if you are pregnant or a kid.
The Ravenscroft glass company is still a going concern but I notice that their website splash page claims them to be:
“The Leader in Handmade Lead-free Crystal…”


