I know this is an old thread and last brought to life 11 days ago. Sorry.
I worked at a hot house that took in blue and green bottles to be recycled. The bottles would get run though a hammer mill with a coarse screen along with all our scrap. We kept 2 crucibles full of recycled glass at all times. We kept an area set up at all time to blow glasses and were expected to blow glasses with our "down time".
I know we tossed in 1/4 cup of some "powder mix" with each 5 gallons of recycled crush. We would have to mix the recycled crucibles every morning or we would get cracks. If we ended up with a terrible batch we would make "glass rock" out of it.
I don't know how much they made off the glasses after the prep work, but it kept us working so people had something to watch. I think the recycled part help the sales a lot.
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