A chart that a Brunswick rep sent me a long time ago (1998,9?) showed the Fire Quantum as being specifically PK 18 pearl.
FYI it's an Microsoft Excvel spreadsheet of Brunswick & Quantum balls from 1995 - 1997, giving Avg RG, RG Diff, Covertsock name. If anyone wants a copy, send me your email address. I don't have a central place to post it.
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"None are so blind as those who will not see."