Okarei Korako Geothermal Park The Artist's Palette is an almost level, 10,000m2 silica sinter terrace at Orakei Korako. Artist's Palette fills an old hydrothermal eruption crater that formed between 8,000 - 14,000 years ago. Clear, blue, alkali chloride water forms pools, springs and geysers. The geysers on the terrace erupt at irregular intervals.