ice curtain

Today, we snowshoed up the mountain to a rock formation called "le Bleue". Along the top of the cliff runs a trickle of water that slowly drips off the edge. In the winter this freezes and forms an ice curtain. You can even go behind the curtain into a cave of rock and ice. The ice varies in colour from blue to creamy yellow. The rock face is granite and I imagine the pale blue is from minerals migrating to the water, glaze made from granite dust makes this colour apparently, I've not been able to get the dust fine enough. The yellow is from iron in the earth on the rock. The ice is luminous, at least 6" thick. I will try to make a glaze like this, maybe nepheline syenite with ash. I get the creamy yellow with black slip covered with thick ash. The sun is strong and the ice is melting drip, drip drip, icicles down to the ground [snow].