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Black
grey
A green object would look blaack in a red light because coloured objects absorb all colours except the colour they are, so a green object absorbs 6 colours (red, orange, yellow, blue, indigo, violet) and reflects 1 (green). In this situation, there is no green light to reflect and it can't reflect other colours, so it looks black. :)
They are white or blue. After they become this colour they explode and become a black hole.
becuse when you look at it turns black and affect the marine life
Black
red filter
Black
black
Blue what ? ! ? Do you mean an object that appears blue in white light ? Such an object appears black in green light.
Black, because the blue light would be absorbed into the object's pigment and as there is no green light to reflect, the object would appear black.
Black I think
it should do objects absorb all light except light of the colour of the object if there is no light of that colour the object appears black
black because blue light cannot pass through a yellow filter
Blue is a primary colour. Black is the absence of colour.
Black because if a red light reflects off the blue surface there is no reflection, so the surface looks black.
Black or Blue-ish Black