I inherited a portion of my uncle's rock collection when he died about ten years ago. He was a hobby jeweler and did his own lapidary in his basement. Many of the stones he made jewelry with were found by him during his lifetime as a rock collector by going to rock digs or simply collecting Lake Superior agate along the shore.
Included in the box of mystery rocks and rough gemstones were two small jars of turquoise.
The jar on the right is what is called "chalk turquoise" and it is rather chalky and grinds down fairly easily.
A beautiful, soft blue green color. So the question is (it is ALWAYS my question!) what about lightfastness? I am particularly interested because of the genuine turquoise Daniel Smith brand paint lightfastness results that Jane Blundell shared. After 19 months in a sunny window, they did show some fading.
You might think that "some fading" after 19 months would be no big deal, I mean, which plant dye could ever hold up that long in full sun? (Spoiler: none of them.) The part that is fascinating is...why? Why does turquoise fade? And if it does, how quickly?
Makes a greenish color when painted out (interesting!) and it isn't vibrant enough that I'd use it for my work anyway, but still...a fun experiment.
So I covered a piece of wood as well as some watercolor paper and left it in a south facing sunny window for a month. There was no change. So I left it another month...
No idea if with more time they would indeed fade, or if the Daniel Smith brand paints that were tested in the link shared above have something else going on. Not sure, but very interesting.
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