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Usually, the coloring of black material requires 12-13 micron thick oxide film, 5-6 kg/ton of stannous sulfate and 7 kg/ton of colorant.
While using copper salt colorant to color black material only needs 7-8 micron thick oxide film, 1 kg of stannous sulfate and more than 1 kg of colorant, which can greatly save the cost.
Tank liquid composition is simple, easy to operate and manage.
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