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Black iron oxide
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With saturated blue ink light black, hiding power and tinting strength are very high, the role of light and the atmosphere is very stable, insoluble in alkali, slightly soluble in acid, completely dissolved in concentrated acid, heat resistance is poor, in the case of temperature higher than 90 DEG C, easy oxidation, the generation of iron red, it has a strong magnetic, can be attracted by the magnet.
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