vivk Posted September 24, 2014 Report Share Posted September 24, 2014 Hi all my local hardware store sells a product called Black Oxide which is used to colour cement. Has anyone tried this is a glaze recipe?I dont know the chemical formula as their product website does not give that information, only that it is derived from anthracite and coal. So I dont know if it can be used for glaze? Can anyone help? Link to comment Share on other sites More sharing options...
Ben Posted September 24, 2014 Report Share Posted September 24, 2014 Without a chemical analysis its impossible to say exactly whats in that "black oxide". We can make some guesses as to content based on the anthracite/coal makeup. Anthracite is a type of coal and they are combustible and may contain a fair amount of sulfur . This could be bad in an electric kiln or indoors. Not sure it will be of much use. Link to comment Share on other sites More sharing options...
TJR Posted September 24, 2014 Report Share Posted September 24, 2014 Vivk; Back in the day we used a cement colourant as a substitute for red iron oxide. It was a lot cheaper, but it was also weaker in strength, so you had to use more. Some of these things work, but require testing. The coal would burn out and would not affect the colour of the glaze. test,test,test. TJR. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted September 24, 2014 Report Share Posted September 24, 2014 Anthracite and coal are themselves black substances. For cement... that will certainly color the cement. They get the black mainly from CARBON compounds. Put carbon in a kiln and take it up to combustion temperature ... and it burns to carbon dioxide... a colorless gas. So likely...... not much in there that is ceramically active coloring chemistry... unless they have in gredienmts that they are not stating (quite possible). best, ..............john Link to comment Share on other sites More sharing options...
Mark C. Posted September 24, 2014 Report Share Posted September 24, 2014 Its not the same. Mark Link to comment Share on other sites More sharing options...
vivk Posted September 25, 2014 Author Report Share Posted September 25, 2014 Hi all Many thanks for all your input. On the strength of your answers I wont be wasting my time- was just interested in the idea! Link to comment Share on other sites More sharing options...
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