Sebastian Blackie explains more about Matsuzaki s shino glazes here:

Shino is a glaze made almost entirely from the feldspar family of minerals. When they melt they form a liquid of high viscosity that continues to move with great sluggishness at much higher temperatures. Feldspars that are alkaline and low in silica typically produce a thick white glaze breaking to pink or red in the presence of iron oxide. Matsuzaki brilliantly combines layers of different feldspars which interact in firing, forming eutectics (a mix of two materials that melt at a lower temperature than either alone) at their interface, causing the materials to slide over one another to produce glaze effects of great drama and movement. White Shinos on iron-bearing clay bodies will slowly darken as they absorb the oxide. This glaze quality is rarely seen outside Japan. It is the result of seven day-long firings at relatively low stoneware temperatures; a legacy of the inefficient (in Western terms) Anagama kilns in which Shino glazes were first fired. This quality is the product of long firings but also the embodiment of a ritual where the potter is physically and emotionally stretched in the process of giving some permanence to his work.

Accompanied by a signed, made to measure box.