Bowls spray chalk is used to mark a bowl that has touched the jack, this is only on the delivery of the bowl and not one that has bumped into it by
being knocked by another bowl. Players at the jack end or head will spray the bowl with the chalk.This is supposed to be the person in charge of the head but it is usually the person with some chalk. A couple of puffs is usually enough. This must be done quickly before the other bowl comes to a stop.