Barnard Black Clay

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Quick Overview

An iron rich clay capable of producing light brown to very dark clay bodies and glazes.

Barnard Black Clay

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An iron rich clay capable of producing light brown to very dark clay bodies and glazes. This clay can be used to produce brown to dark chocolate colored clay bodies for nearly any temperature. The clay becomes darker and richer in color the hotter it is fired. Known to contain around 30% iron oxide and may therefore create some problems with bloating especially when used in high amounts in clay bodies and when fired in reduction beyond cone 6. 

Digitalfire.com 

Oxide Analysis Formula
CaO 0.60% 0.14
MgO 0.70% 0.23
K2O 1.10% 0.16
Na2O 0.60% 0.13
TiO2 0.20% 0.034
Al2O3 7.60% 1.00
SiO2 47.00% 10.50
Fe2O3 33.90% 2.84
LOI 8.31
Oxide Weight 1230.71
Formula Weight 1342.25
 

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