Black. Something that doesn't reflect any color of light will look dark, black.
Since an object is observed as the color(s) it reflects, a green object absorbs all colors and reflects green.
Assuming that the light you are shining on the object is white, then the object is also blue. Objects appear a certain color because they reflect that color to our eyes and the rest of the colors in the light are absorbed by the object.
Since an object is observed as the color(s) it reflects, a green object absorbs all colors and reflects green.
Reflects, other wavelengths (colours) are absorbed.
If it reflects that color of light, you're eyes will see that color being reflected by the object (when the color is being shown on the object, white light contains 'all' colors of visible light). If an object absorbs a color of light you will tend not to see it coming off of the object. Translation: objects will appear the color(s) of light that it reflects. If an object appears red, it reflects red light.
When the color of an object is the same as the color of the light shining on it, the object will appear brightest and most vibrant. This is because the object is absorbing all other colors of light and reflecting only the color that matches its own.
The color that we see is not the color of the object in question, but the color of the light it reflects. This means that a "green object" absorbs all colors of the visible spectrum except for green light, which it reflects back to our eyes. White light is the combination of the entire visible spectrum combined. Thus a "white object" reflects all colors of light. On the opposite side of this question, a "black object" absorbs all colors of light, because "black" is the absence of color.
White reflects all colors because it contains all wavelengths of visible light. When white light strikes an object, it reflects back all colors equally, making it appear white to the human eye.
An object appears a certain color because it reflects specific wavelengths in the visible spectrum while absorbing others. For example, a blue object reflects blue wavelengths and absorbs other colors.
It will be white, because really, objects both reflect and absorb colors. For example, a red object absorbs every color aside from red, which reflects back. White absorbs no color and reflects all colors, while black absorbs them all and reflects none. the rainbow will be reflected back
An object's color is comprised of the wavelengths of light that it reflects - so an orange object reflects reds and yellows while absorbing blues and greens, while a green object is the opposite.
When an object reflects all wavelengths of visible light, you see it as white. This is because white light is composed of all the colors of the visible spectrum, and an object that reflects all these wavelengths appears white to the human eye. Conversely, if an object absorbs all wavelengths, it would appear black.