Alex Honnold, Adam Ondra don’t use chalk … what’s doing on?
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It’s not chalk; it’s rosin, a sticky tree sap derivative. It dries your skin and is slightly sticky in a dry sort of way.
Climbing makes you sweat, including your hands. Rosin is oil-soluble but not water-soluble. The same stuff is used for violin bows and (I think) pool cue tips. Bowlers use it too.
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