Gold chloride functions as which outcome in some staining sequences?

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Multiple Choice

Gold chloride functions as which outcome in some staining sequences?

Explanation:
Gold chloride is used in the toning step of silver-based staining sequences. After metallic silver is deposited in the tissue, applying gold chloride deposits gold onto the silver image, forming a silver–gold complex. This process stabilizes the image, improves permanence, and shifts the color toward a brownish/golden tone, enhancing contrast and resistance to fading. It’s not acting as a mordant to bind dyes, nor is it a reduction or oxidation step.

Gold chloride is used in the toning step of silver-based staining sequences. After metallic silver is deposited in the tissue, applying gold chloride deposits gold onto the silver image, forming a silver–gold complex. This process stabilizes the image, improves permanence, and shifts the color toward a brownish/golden tone, enhancing contrast and resistance to fading. It’s not acting as a mordant to bind dyes, nor is it a reduction or oxidation step.

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