This time to Mt Gambier.
One of the amazing attractions is The Blue Lake.
The famous Blue Lake of Mt. Gambier was formed out of a volcanic crater, which last erupted 5000 years ago. The Blue Lake mysteriously turns from a winter grey colour to a brilliant azure blue in the month of November, lasting till April.
This has been a mystery for many, many years...until it was finally scientifically explained to be attributed that light is scattered by calcium carbonate which saturates the lake. As the temperature rises at the surface level it causes them to precipitate out as extremely fine particles of a similar wavelength to blue light. This causes a scattering of the light at the blue end of the spectrum, making the lake appear blue.