Theming product field in template.php D7
I am attempting to theme a product field in my template.php file but I have no idea the correct way to reference the field. I have looked for documentation, but come up empty. Here is an example:
The field machine name is "product:field_product_images".
Normally the theming function would be:
Obviously the ":" in the machine name doesn't belong, but I can't get the function to work replacing it with "_" or dropping the entire "product:" prefix.
How do I reference this field to access it in the theming function?