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I’ll keep this post short because there isn’t much to be said. Powerlifters, gymnists, rockclimbers all use chalk. It is clearly effective.
The goal of lifting is not to work your grip strength, grip strength is useless in swimming. Missing a rep on pullups because of lost grip is only going to hurt you, and all the energy wasted on grip can be used better somewhere else.
Go to amazon, and buy yourself a bag of chalk. They cost 5-10$.
P.S. if you’re stingy like me, and think you can save money by using classroom chalk, don’t waste your time. I’ve already tried it, and it doesn’t work :p