What is the purpose of pickling in the context of gold castings?

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Involves immersing the casting in a baking soda solutionLeads to the formation of pores within goldEliminates surface oxide layers from gold castingsCleans off the investment material from gold castings

Explanation

Pickling is a process used to remove oxide layers that form on the surface of gold castings, ensuring a clean and smooth finish. It does not involve baking soda soaking, cause porosity, or remove investment material.