Implosion
Here is how I do it.
As I get the implosion near the last 'push' on the marver plate I try to have a shallow indent (3mm to max 5mm deep) with rounded 45 deg side angle and rounded shoulder. I let the marble mass cool a bit so it is stable and then concentrate a smaller flame on the indent almost directly head on. I want to get a hot hemispherical area surrounding the indent that includes some of the maria side glass. When that is ready I reach into the indent with a 3mm or 4mm rod and grab the bottom of the indent and pull it inside out. I only pull until I see no air trapped and see a nice stretched stem; about 10mm or 12mm. I rip off the scuzzy glass until I have a clean point with just a pin point of bright color showing. At this point some people add a bit of green to extend the stem effect. I then gently bring the whole marble mass up to heat and let gravity and surface tension round the mass into a sphere then I go to the mold for shaping and finishing.
PJH
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