In reply to jkarran:
His girlfriend abseiled down and brushed it, but didn't chalk anything I don't think, she just said "it's a different colour, you'll see it when you're up here!". His 'ethics' (I hate that word) were pretty strict. He had a mat on the bottom, but insisted it was removed the minute he was on the rock, because it was 'just to keep his feet clean'. He wouldn't even ab down himself to brush it, and then his girlfriend told us that he'd closed his eyes and covered his ears when it was on some video or other!