blue and green marks on a g u bat

[lowell25]

I have a brain cramp, could someone let me know what the blue and green marks represent on the game used bats. Blue marks BP balls and green marks game day balls?

[suave1477]

Lowell other way around.

[sox83cubs84]

Keep in mind, also, that prior to 2000, when each league had their own baseball, NL baseballs had black print and AL baseballs carried a green or blue color, depending on the era.

Dave M.
Chicago area

[coxfan]

The four MLB BP balls I've seen close up were regular balls with the same blue markings as game balls except absent the rub-up mud; although one of them, marked " practice", had lighter blue markings than regular game balls. Also, some g-u balls are recycled for BP. So it's hard to be sure of anything from the color of markings. I think it varies.