The color of the bulb at the bottom of a lava lamp can be changed. A special bulb can be put in that changes through the colors, blue green and white. This means in some circumstances, the lava, although green, will appear black. What color bulb will make it appear black?
I know the answer is blue, but when the light is shined against the green liquid, I understand it will be absorbed, but why will it turn black?
Thank