Agreed Herschel! Maybe the sky also contributed to it? :) Andy > On Jul 19, 2018, at 10:57 AM, Herschel Mair <herschphoto@xxxxxxxxx> wrote: > > My guess is the blue isn’t coming from the water... it’s the pool that’s painted blue... I would imagine that water reflects the full spectrum. It absorbs long wavelengths in transmission but the surface is like a mirror.