Also, if you do decide to tack fire at a lower than full fusing temperature, to avoid dog-boning, your piece will be of uneven thickness. Based on the thickest part of the piece before firing, anneal twice as long as you would if the piece were of an even thickness throughout.
For instance, if the base is 3mm thick, and you have flowers made of thin glass (2mm thick) and frit balls on top of that (4mm?) that adds up to 9mm thick. Use the annealing schedule for a slab twice that thickness (=18mm).
If you use a faster annealing schedule, your piece is in danger of breaking as it cools down.
Good luck with your project!
Mary Kay Nitchie
Bullseye Glass Co.
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