I bought 2 12X24 pieces of tumbled travertine coping from Noble to test at home. We are considering using it to replace our existing red brick coping on our pool remodel. I thought I would share some of my testing results here. We want our new coping to be less hot than our "pizza oven" existing red brick coping and less slippery. We don't have any staining problems with our red brick coping and were a little worried about possibly having staining with travertine.
STAINING TEST - I tested things that we might commonly find outside by our pool: green fruit juice, mustard, ketchup, salsa, spray on sunscreen, white sunscreen and insect spray. We do drink red wine but not usually outside as beer seems to go down easier in hot weather (plus I didn't have an open bottle to test). I was going to test mashed up strawberries, but the kids ate them before I could. It is currently 75F here.
STAINING RESULTS - None after an hour. Well, if you looks super closely you can probably see the mustard left a little bit of the stain but it doesn't bother me at all, and I know with a little more scrubbing and water in time it wouldn't be noticeable in the least. And, honestly, after living with the pool for 10 years we have never had a giant glob of mustard on the coping.