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Old November 7, 2011, 11:04 AM   #7
Senior Member
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,043
Vanes, fins... whatever you call them, it's all mold flash. This is caused by the mold faces not closing tight together.
But, there is the "fins" caused by too much pressure (lead forced out into vent lines), too much Tin, too hot. But they are usually not a problem, other than annoying...they can just be ignored and pressure (do not hold sprue hole tight against bottom pour spout), heat, technique adjusted to eliminate them.
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