Pickling________________?
Correct answer: D. Removes surface oxides from gold castings
- A. Is accomplished by soaking the casting in baking soda
- B. Causes porosity in gold
- C. Remove investment from gold casting
- D. Removes surface oxides from gold castings
Explanation
Pickling uses an acidic solution to dissolve surface oxides and tarnish from a casting, particularly after heating. Baking soda is not the pickling treatment, and investment removal is divesting rather than pickling.
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