I always try my best to color match. However, if the ball is a multi-color pattern it's tough, not impossible but takes a lot more work and time. To get a ball where you can not tell it's been plugged, IMO, that's almost impossible. A good match, you bet, impossible to tell, next to impossible.
JMO
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net