Powder chalk tends to create excessive dusty chalk clouds around you. This releases fine particles into the air of the enclosed environment. This is why some indoor climbing centres no longer allow powdered chalk, and only liquid chalk. Make sure you check what’s allowed before going climbing.
WARNING IF USING CHALK OUTDOORS
Outdoors, the advantage of powdered chalk (or crunch) in a chalk bag is that you can chalk up whenever you need on your route.
The issue is that the chalk leaves marks on the rocks. This is why it’s recommended that you brush off holds after completing your route to leave as few traces as possible in these fragile environments. We recommend brushing them off with a climbing brush, specially designed for this purpose.