Is a polaroid photograph considered additive or subtractive color?
Photographic prints (including Polaroids) do not emit light. All photographic prints are viewed via reflected light (subtractive color). In other words, the light is reflecting off a surface. Light hits the surface and some photons of particular wavelengths are absorbed by the object (or pigments) while others are reflected - this is what gives a solid object colour. Anything else that shows colour by reflected light is also using subtractive color. That would include any solid (non-transparent) object in the real world too, including paper with ink or paint on it. Computer screens and TVs emit colored light (additive color).
