When I want to make marbles from bottles I break the bottles up in a paper bag, one bottle at at time. Then I place the shards into a small, 1 - 2 inch, clay flower pot that has several coats of kiln wash on the inside. I then put the flower pots into the kiln and run it up to 1450 for about a half hour then back down to 950 for an hour, then down to 725 for a half an hour then down to 600 and off. This makes a nice puck to form into a marble. I have found that in this case it is much more efficient to make a batch of pucks than it is to try to melt it all at the torch. Electricity is cheaper than oxy. I imagine you could also pull the puck into rods if you wished.
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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