I wanted to ask if any filters exist that Subtract just one color/wavelength, and let all others pass. So a blue "subtractive" filter, let's say, will block off only blue and let all others pass. This is cool because this would preserve the original color constitution of the object, rather than just making everything look like the color of the filter (as we saw above).
So, is this possible? Do such "Subtractive" filters exist? If so, please link.