Making "mineral streaks" via inking is a farily mature art form. We have no qualms over staining wood. We accept engraving and coloring steel as natural. Why the stigma over inking a plain candidate stock to improve its appearance?

The modern gun may include CAD design, CAM machined parts, high alloy steels, non-ferrus alloys, plated metal, laser engraving, poly wood finish, etc. So, why get any heart burn over inking wood?

Few can order a best gun. Most can buy/build a beautiful gun. Wallet determines how much of the beauty is completely natural and how much requires some "assistance."