Ilford Ortho Plus is an orthochromatic black and white negative film, meaning it is only sensitive to blue and green light. It is ISO 80, very sharp and very fine-grained.
The orthochromatic sensitivity lends itself very well to creative use, because any red light simply does not expose the film and will come out black in the inverted image. Freckles come out darker, red flowers render black, you get it. Makes for beautiful landscapes.
Can be handled under a red safelight.