I think... is the answer. After two break tests and surviving after doing it for 15 years, I think sharpie permanent markers are safe-ish. HOWEVER, after hanging out with Brent Roth who is helping us launch our HowNOT2 Canyon series, I'm a believer in the Beal rope marker found at https://amzn.to/3yUZUhy. He gives a firehose of useful information in rope care and marking your ropes. This is one of our best episodes!

Brent's fancy descenders can be found at:
*https://www.canyoneeringusa.com/store...
*https://www.onropecanyoneering.com/ca...
https://www.canyoneeringusa.com/store...
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00:00 Funny Playful Intro
01:39 Beal Markers are better
04:23 Previously Marked Ropes
08:04 How to Mark a Rope
15:57 Marking ends of ropes
19:09 Setting up the break tests
20:41 Break tests
23:09 Bloopers