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A plastic part can meet its mechanical requirements and still fail inspection if the color is uneven, dusty pigment contaminates the line, or the shade changes between batches.

Color decisions in plastics and rubber production often look simple until they reach the machine. A shade that appears correct in a sample can still cause streaks, unstable flow, surface defects, or unexpected reject rates once heat, shear, and real production speeds are involved.

Color problems often appear late in production, when materials have already been processed and rejected parts are costly to fix. A shade may look acceptable in a sample but turn uneven, dusty, streaked, or inconsistent after molding, extrusion, or rubber processing.