Fooling around for a different look. The photos here were taken through either a Hoya R72 filter or a Wratten 89B gel filter. Both filters look black because they block out almost all visible light, but they let through the Near Infra Red from 720nm to longer wavelengths. Everyday materials have vastly different reflectivities in the IR, e.g. foliage is highly reflective and it comes out very bright. Black trousers sometimes are very transparent to IR and white panties may sometimes show through quite clearly...