Somebody says these primitive forms of multicolor strobe lights came out in the l950"s and that sounds about right.
They did in the late 50's and into the 60's aluminum Christmas trees were very popular.
pink
Copper is a poor reflector of light due to its reddish-brown color and high absorption rate. Aluminum, on the other hand, is a good reflector of light due to its high reflectivity property, making it commonly used in reflective surfaces and mirrors.
A black reflector creates shadows by blocking light.
1950
Bulk aluminum is usually a silver color. (Think aluminum foil.)
white perhaps
Yes, aluminum does not change color when heated.
No, black is not a good reflector of light. It absorbs most of the light that hits it rather than reflecting it, which is why it appears dark.
Aluminium foil reflects more heat than white cardboard.
Blue color was introduced in India by the mughals.
Yes, they can be used. You may also want to look for a color wheel to go with it. When the aluminum trees came out they also had a wheel that rotated with different colors on the tree. Nothing can catch fire on these trees and they are very "modern" in their way.
aluminum is a grayish color, and lightweight