I feel it is unrealistic to produce a "hybrid" bowling ball with the colors representing the quoted materials. This would require a precise pour in order to provide a consistent reaction.
Imagine the Storm Frantic
![](https://www.ballreviews.com/proxy.php?request=http%3A%2F%2Fimg0096.psstatic.com%2F123195606_storm-frantic-bowling-ball-16-lbs-ebay.jpg&hash=5a7b77400b404dd15d8b62a66bdc8004c2d831f0)
It would appear to be impossible to have actually different materials representing the two colors and have a consistent reaction ball-to-ball.
My understanding is what we perceive as pearl in a ball is an additive that affects appearance only. The entire coverstock is the same material blended however is needed to achieve the reaction. It may be 80/20 urethane to resin, but each color has this same mixture.