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A comment on Alex Honnold Scales El Capitan Without Ropes, and the Climbing World Reels. Parent comment

Re:Alex Honnold Scales El Capitan Without Ropes, and the Cli... by mcphage on Tuesday June 06, 2017 @04:12PM (#14500873)
When I was a math grad student, most of the other grad students hated getting chalk on their hands because it dried their skin out. Whereas I'd grab extra chalk from the board, and rub it over my hands to keep them dry.
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Re:Alex Honnold Scales El Capitan Without Ropes, and the Cli... by justinator on Tuesday June 06, 2017 @11:27PM (#14503517)
Chalkboard chalk is calcium sulphate, whereas climbing chalk is magnesium carbonate.

You would not want to use chalkboard chalk for climbing, as it would make holds actually slipperier.

Some climbers do carry a piece of chalkboard chalk to mark key holds, though.

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