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Subscriber Extra: Reticulation Glazes


Reticulation glazes form a group of specialized glazes that show patterns of heavy crawling, or reticulation. The patterns look similar to lichens, lizard skin and leopard skin, depending on the glaze base, underglaze coatings and firing temperature. The same glaze may give very different results at a variety of temperatures.

Putting the reticulation glazes over a colored slip allows the top glaze to move and the visible cracks to be colored between “islands” of glaze. Any colored slip will do, but one of the most interesting is usually black, as it intensifies the color of the covering glaze.

With reticulation glazes applied heavily over the slip and fired at cones 04, 6 and 9-10, and with added colorants, a wide range of textural possibilities can be developed. The main requirement in the glaze is a big saturation of magnesium carbonate as seen in the two typical base glazes below.

Hopper LG #1

Soda Feldspar 27 %

Magnesium carbonate 28

Ferro frit 3134 9

Ferro frit 3195   5

Talc   7

Zinc oxide   5

Kaolin 19

100 %

Hopper LG #2

Soda Feldspar 35 %

Magnesium carbonate 25

Ferro frit 3195 10

Talc 15

Kaolin 15

100 %

Excerpted from The Ceramic Spectrum by Robin Hopper. For more information, visit

Key for Colorant Additions

b = cobalt carbonate

c = copper carbonate

d = manganese dioxide

e = nickel carbonate

h = chromium oxide

u = Commercial Yellow Stain

vg = Commercial Victoria Stain

x = Cerdec/Degussa inclusion red stain 27496

Key for Firing

6 Ox = cone 6 oxidation

9 R = cone 9 reduction


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