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I researched this some and this is what I came up with to help others that want to learn how it is done. Please take any safety precaution for any unforeseen accident that possibly could happen. I am not saying it will, but prepare just in case. The information I have found says: "During the 1950's clearies were used to make "fried" marbles. The clearies were heated then immediately submerged in cool water, causing the marble to fracture internally. The exterior of the marble remained intact while the interior gleamed like a cracked mirror. Fried marbles were used in jewelry and other crafts...... " Taken from: Aggies, Immies, Shooters, and Swirls, The Magical World Of Marbles. By Marilyn Barrett
Here is a link I found to a video about the process.
Thanks Danny. Nice work.
Glad to be of help to anyone that needs it Steve!
Cool! I have that book as well! LOL It has amazing photos.