The composition according to claims 8, wherein said carbon comprises amorphous graphite.ĩ. The composition according to claim 1, wherein said iron(III) oxide comprises hematite said iron(II,III) oxide comprises magnetite and said glass comprises sodium-lime-silica glass.ĩ.
The composition according to claim 1, further comprising from about 0.1 to about 25% by weight carbon.Ĩ. The composition according to claim 1, wherein said glass comprises borosilicate glass.Ĩ.
The composition according to claim 5, wherein said soda-lime-silica glass is cullet.ħ. The composition according to claim 4 wherein said soda-lime-silica glass is selected from the group consisting of container glass, window plate glass, glass cullet, and combinations thereof.Ħ. The composition according to claim 1, wherein said glass comprises soda-lime-silica glass.ĥ.
The composition according to claim 1, wherein said iron(II,III) oxide comprises magnetite.Ĥ. The composition according to claim 1, wherein said iron(III) oxide comprises hematite.ģ. An anti-veining additive composition for sand cores used in metal casting, said composition comprising: (a) from about 20 to about 70 % by weight iron(III) oxide (b) from about 20 to about 70 % by weight iron(II,III) oxide and (c) from about 10 to about 60% by weight of a glass that is substantially free of lithium oxide wherein said iron(III) oxide and said iron(II,III) oxide are each comprised predominately of particles having a particle size less than about 75 microns.Ģ.
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