What is the problem if a person sees both gold and silver as silver? This person also has red-green defects.
Since you mention that the person has a red-green deficiency, that really answers the question. A red-green deficiency can be consistent with a confusion of silver and gold. Although it would depend on the illumination, the discrimination between silver and gold (which is a color discrimination) could well fall along a line of confusion for a person with red-green color blindness. You might take an image with silver and gold in it and process it through the tools at vischeck.com.
