Quote Originally Posted by pmaru77 View Post
What's that phrase, "once you go dark you don't go back?"
Think maybe you're confusing "pools" with something else. Dark pools are a headache in most cases, but they look cool even though they usually get too hot in the summer sun.

What causes the discoloration? Chemicals, I would guess.
Nope. Plaster and dye qualities, plus installation technique. Some of the same 'streaking' occurs with white plaster, but you don't see it without the added dye.