Self-supporting “witness” cones are the most accurate and easiest to use cones available. Cone holders or plaques are not needed. Many glaze and kiln manufacturers recommend use of witness cones to achieve best firing results.
25 cones per box.
How to use:
When using witness cones in your kiln, place cones on each shelf. It’s common and recommended to use 3 cones on each shelf: one cone is the actual target temperature, one cone is one increment higher, and one lower. For a cone 04 firing, the trio of cones would be one each of 03-04-05. This combination will indicate how accurately your kiln reached the target temperature on each shelf of your kiln. Regularly using witness cones gives you the true measure of how accurately your kiln fires to the desired temperature. Leadfree glazes require consistent firings to the proper temperature to achieve proper clay/glaze fit and to meet food safety standards. Witness cones are a must for porcelain doll firings, too. Porcelain is unforgiving, and there is no margin for error.
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