Well, now I've officially read everything! This is completely backwards! Chalk SHOULD BE DRY! Nothing ruins chalk like humidity. Don't get water on your tip. Don't get water on your chalk.
I played in a poolroom during an unusually hot and humid summer, were the windows were kept open. It kept raining for weeks. All the house chalk became useless. You'd make several passes and the chalk would not adhere to the tips, or it would be very uneven. Even when you made several passes, and covered the tip pretty well, you occationally miscued. I don't know if it was sweat (the combination of salt and water) or just humidity that ruined the chalk, but it sure didn't work to well. I had to bring my own chalk from home and take it back home after playing. Leaving it in the locker at the club would ruin it.
I played in a poolroom during an unusually hot and humid summer, were the windows were kept open. It kept raining for weeks. All the house chalk became useless. You'd make several passes and the chalk would not adhere to the tips, or it would be very uneven. Even when you made several passes, and covered the tip pretty well, you occationally miscued. I don't know if it was sweat (the combination of salt and water) or just humidity that ruined the chalk, but it sure didn't work to well. I had to bring my own chalk from home and take it back home after playing. Leaving it in the locker at the club would ruin it.