Resin, rosin, pof. Whatever you call it, it's widely accepted that we should NOT use it while climbing. It's said to ruin holds - both indoors and out. Now it might be in your chalk. Block, liquid, and powder. 
This is a public service announcement. 
Learn more about the science of climbing at https://www.powercompanyclimbing.com/breakingbeta
Read more about pof and rosin usage at these links:
https://www.ukclimbing.com/forums/bouldering/fontainebleau-457439
https://lerockyroad.com/to-pof-or-not-to-pof
https://www.bergzeit.co.uk/journal/info-about-zum-fontainebleau-bouldering/
https://www.climbing.com/gear/why-climbers-started-using-chalk/
https://www.midnightlightning.co/removing-rosin-from-liquidchalk
You can find us at www.powercompanyclimbing.com
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