The second way - putting the encased opal into the maria before starting to lay down your lines to make a flower - did not result in any air bubbles, however neither did the first way - after making the flower, shoving the encased opal into the top of the lens.
If one is having a problem with trapping air bubbles right up against the opal while encasing it using a tube, I just watched (9/03/2017) a video on Youtube by Revere Glass on how to encase an opal in a tube - it is excellent (thank you Dustin Revere).
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A marble a day keeps the 'willies' away.
Gerald Kappel
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