This mini-article gives and overview of blue dot and red dot squash balls. Click here to learn about yellow dot squash balls. For other information about squash balls, try this one.
Blue Dot Squash Ball
Blue dot balls are beginner level squash balls. These bounce the highest off the floor even when cold, so that a learner can comfortably hit the ball back to themselves and develop an understanding of the physics of the squash. As these are usually used by learners, they wont get whacked around as much and hence wont get very hot. This allows them to stay at room temperature and maintain their bounciness.
If you are a club level player or a pro, and decide to play a game with a blue dot ball, you will have indefinitely long rallies that can only end either in tins, pancake nicks or with the ball flying out of court into the next dimension.
Do try it for fun sometime.
Red Dot Squash Ball
This is the next level up from the blue dot ball. Red dot Squash balls bounce slightly less than the blue dot, but not as low as a yellow dot balls. These are for the improving squash player working on their swing and learning to hit consistent and repetitive shots.
This red dot phase is however short-lived as most players tend to graduate directly from blue dot to yellow dot.
The red dot ball does become relevant again for the intermediate player who wants to really up their game. Some coaches recommend practicing volleys with a red dot ball since it comes faster than the usual double dot ball. This training strategy greatly improves racket preparation, racket head speed, and reflexes. After doing a long training session with a red dot ball, one would see a double yellow as if it were suspended in air and waiting to get hit.