The colour white reflects any other coloured light that is shone at it, for example if we shine a yellow light at a piece of white paper the paper will appear yellow. In different conditions light can appear more cool in a shady area or warm toned in direct sunlight. Unlike our eyes a camera can only record the wavelengths hitting its sensor, this means something that seems white to us may not appear the same colour in a picture. we can change this using the pre set white balance settings or using the kelvin scale which allows us to change the as much as we want. I took six photographs of the same thing and changed the white balance each time to show how it changes the colours in the image.