On 16 March 2017 at 20:07, David Mann <[email protected]> wrote: > On Mar 17, 2017, at 3:31 AM, Igor PDML-StR <[email protected]> wrote: > >> Some 4 years ago, during my trip to Banff National Park in Canada, >> I also saw amazing blue color (although more teal-ish) of water: >> https://42graphy.org/galleries/banff-2012/_IR37060.html >> A frequent question that tourists ask there is what is the origin of such a >> color. Someone told the story that some local guides feed to some naive >> tourists that they regularly paint the bottom of the lake to get that look. > > The true source of the colour is "rock flour". This lake (among others in > the region) is fed by glaciers and the water contains finely-ground particles > of rock that were ground up by the movement of the glacier.
Rayleigh scattering. Just ask xkcd :) https://xkcd.com/1818/ -- Eric -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
