Snooker was always a fun watch on B&W TV. You kind of figured out the different greys, with a little help from commentary pointing out that the blue was now behind the yellow... err... :)
Surprisingly it worked well enough to be worth watching.
There was a famous 'gaff' by commentator Ted Lowe, who said: "Steve is going for the pink ball - and for those of you who are watching in black and white, the pink is next to the green."
Worth noting that this sounds like a joke or a gaffe, but might have been a very reasonable thing to say. Assuming the green was on or near its spot (its starting position), which is likely, every snooker fan would know which ball was the green.
Surprisingly it worked well enough to be worth watching.