There are three major classes of the interaction of color : simultaneous contrast successive contrast and reverse contrast ( or assimilation ) .

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The method converges faster than conventional successive approximation method ( SAM ) and can be applied to high conductivity contrast formation .

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A new method for the successive determination of Fe u3001 Mn u3001 Zn in black rice a new mate - rial by mixed standard was studied Meanwhile the contrast determination was made with rice after taking off black and results were quite satisfactory .

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