Ingredients

Ingredient Amount
Colemanite 5.70
Ferro Frit 3110 77.00
EPK Kaolin 7.20
silica 10.10
Add Amount
Copper Carbonate 6.00
BENTONITE 4.00

Instructions

This is normally a cone-03 raku glaze, but it can be fired to higher temperatures. Apply thin as the glaze is fluid and runs during the firing. 

Mixing: I usually add the water to a 5-gallon plastic bucket, which can hold a 10,000-gram batch. The water is usually lukewarm to warm, and I always add hard-to-dissolve ingredients like soda ash first. I blunge each ingredient into the glaze with an electric drill and blunger. Once all the ingredients are in the bucket, I continue blunging for 5 minutes. I add just enough water so that when I dip my hand in the glaze, I can see through the glaze to my fingernails. If I cannot see my nails, I keep adding water. If the glaze gets too thin, I let the glaze sit overnight and siphon off water the next day. I then sieve the glaze into a clean 5-gallon bucket.

Application: Apply via dipping or pouring. I prefer letting bisque pieces with wet glazes or slips to dry over- night before applying additional slips or glazes.

Note: Glazes with barium carbonate or high percentages of metallic oxides are generally not food safe.  

 

This recipe was shared in the April 2022 issue of Ceramics Monthly