Each vertical block of glazes below shows one of the six glazes, the results in the four firings are shown, Firing 1 - Firing 4, from top to bottom.

The firings are successively more agressive in the degree to which the cool down portion of the firing is extended. The first three firings incrementally extend the firing in the region 1650 deg F to 1850 deg F. The fourth firing additionally slows the cool down of the firing in a different higher temperature region. The first firing is a control firing, and cools at the rate of my large studio kiln, but has a one hour hold at 1650 deg F. This is approximated by cooling at 300 deg F an hour to 2000 deg F, 250 deg F an hour to 1850 deg F, and 100 deg F an hour to 1650 deg F.

The second firing differs from the control by cooling at 100 deg F an hour in the window [1850,1650] deg F.

The third firing differs from the control by cooling at 50 deg F an hour in the window [1850,1650] deg F.

The fourth firing differs from the control by cooling at 50 deg F an hour in the window [2000,1650] deg F, and 30 deg F an hour in the window [1650,1550] deg F. There is no hold at 1650 deg F in this last firing.

The 6 glazes are also arranged on a grid, with pairs of glazes having successively less CaO and more Alkali metal. The second glaze of each pair has higher SiO2.

The pair of glazes 0_0/0_1 have CaO+MgO = .28.

The pair of glazes 1_0/1_0 have CaO+MgO = .21

The pair of glazes 2_0/2_1 have CaO+MgO = .14