Wow, I've realized from this thread that most of the long time users of this site don't have a clue as to the difference between solid and pearl.
Let me break it down...
Pearl is the actual process of pearlization that the ball goes through. A ball can be a single solid pearl but can still be a pearl since it goes through the process of pearlization when the resin is "glazed"(to put it in laymens terms). Good examples of this is the Riot Zone and EMB pearl which are both pearls but one solid color. Thus it is pearl because IT GOES THROUGH THE PROCESS OF PEARLIZATION AT THE FACTORY!
Next, Solid resin balls can be many different color swirls examples are the Track Hex, Track Voodoo, Columbia Wicked, Monster Bruiser, Monster Smash/R, Inferno(WHICH ARE NOT PEARLS PEOPLE BECAUSE THEY HAVEN'T GONE THROUGH THE PROCESS OF PEARLIZATION!). Solid resin swirl colored balls are not pearls just because they are many different shiny colors.
So all in all, it doesn't matter what the ball looks like, it's the process of pearlization that it goes through so don't judge a book by its cover. The chemists that work for these companies know what they are doing.
I didn't mean to be a jerk about it, I just want to shed some light so everyone can understand.
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-D. Marshall
ScratchBowling.com Shirt Staff 2003-2004