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Making Glaze Testing Cones
Description A standard shape and size of glaze test is important to be able to compare one test with another, especially over time (so that old tests look the same as new ones)
Article
Joe Schmidt, lab technician at Plainsman Clays , has developed a glaze testing cone that is very practical. Perhaps more important, it is a standard shape and size that is always used, this serves very well for comparison and documentation purposes.
Advantages
They are easy to make.
They are easy to photograph
They are stable and less likely to tip over and break
They stack well in boxes
They display a glaze in a way that is akin to a piece of pottery or ceramic .
Steps to make these:
Print the pattern and cut it out
Roll the clay to 1/4 inch (6mm) thickness
Cut the shape out of the clay using the pattern
Apply a band of slip to one end and attach the other using a 15mm (1/2 inch overlap)
Press the joint firmly together (use a stick on the inside to support) and press the indentations
Dry the clay to leather hardness and carve a design on the side opposite the join (to show what it does on edges, in varying thickness around contours and on an uneven surface)
Stamp the identification of the clay at the bottom
Dry the testers carefully to avoid cracking
Use a knife to trim off any sharp edges
Bisque fire.
When dipping these in glaze consider the following:
Dip down to within 15mm (1/2 inch) of the base
Label clearly on the bare clay section
Dip the top half again for a double-thickness.
Pattern
Click here for a PDF file pattern that you can print out.
Related Information
An example of the value of a good glaze testing sample.
These are made at Plainsman Clays in Alberta, Canada.
Preparing to make a glaze testing cone: cutting around the pattern
Making a glaze testing cone: applying the slip for the join.
Making a glaze testing cone: finishing the join.
Making a glaze testing cone: Incising the surface to provide variation.
Making a glaze testing cone: Stamping an identification.
By Tony Hansen
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