The law of constant proportions affects the ratio when two or more substances combine to form a new substance. The law of constant proportion, also known as Proust's law or the law of definite composition, states that a chemical compound will always have its component elements in a fixed proportion, regardless of the pathway undertaken to prepare that substance.<span />
The answer to your question is aluminum.
Color depends on the wave length produced, for example if the wave length is shorter then it would produce violet and when it continues to get higher it produces other colors. from low to high it goes, violet, indigo, blue, green, yellow, orange, red. those are also only in the visible light spectrum whereas there are plenty of other wave we cannot see with the human eye.
A theory is an idea a law is a rule or a statement or fact
