It was this block of ice which helped inspire the composition. Some of the more intense teal color in the shadowed area is with a mixture including Michael Harding's Phthalocyanine Blue Lake oil paint.
Generally my whites are a mixture of titanium white with a touch of cadmium yellow deep. Here, in the sunlit area of the block, I have a bit of gray in the mix. I want to save my warmest "white" for the bear.