On color negative and positive films

Add an M filter in front of the camera's objective lens to shoot B G R Y M C W BL color objects.

The corresponding colors of the negative are: dark yellow, light gray, light blue, light green, yellow, Y W.

The corresponding colors of the positive film are: purple, light green, pink, pink green M BL.

Because there is no chromatographic contrast, we can only do color contrast combination and inversion by brain memory, which may not be accurate.