Reflective, colored, or color-shifting scratch resistant coatings and articles

An article comprising:

• a substrate having a major surface;
• and
• an optical coating disposed on the major surface, the optical coating comprising a multilayer interference stack, the multilayer interference stack having an outer surface opposite the major surface;
• the article exhibiting a maximum hardness of about 12 GPa or greater as measured on the outer surface by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm to about 500 nm;
• wherein the article exhibits:
• a single side average photopic light reflectance measured at the outer surface as measured at near normal incidence of about 10% or less over an optical wavelength regime in the range from about 400 nm to about 700 nm, and
• article reflectance color coordinates in the (L*, a*, b*) colorimetry system for at least one incidence angle from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of more than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), and the reflectance color coordinates of the substrate,
• wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √((a*article)2+(b*article)2), and
• wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √((a*article−a*substrate)2+(b*article−b*substrate)2).