Back Roads Bill: What gives Windex lakes their colour?
They are often referred to as 'Windex' lakes. These Caribbean blue-green-turquoise-aquamarine-coloured lakes dot the landscape of Northern Ontario.Sudbury John Gunn, is the Canada Research Chair in Stressed Aquatic Systems at the Vale Living with Lakes Centre, School of Natural Sciences at Laurentian University. He explains the colour range of lakes found in and around the City of Greater Sudbury region including the La Cloche Range.
It is thought because there may be no drainage in and out, there is an unusual input of water loaded with iron and particulate organic matter. The slight amount of suspended silt particles refract blue light. We have to go back to high school chemistry to understand how the Windex lakes get their colour, he said.
“In Northern Ontario, I have always preferred high/low pH for the basis for Windex lakes as quartz can come in many colours but mainly white or clear which does not in my mind give a blue colour, even if finely ground. He said if it was glacial silt one expect to see some of that colour in the fine-grained sediments deposited in winter.
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