Answer:
The amount/type of stain
Explanation:
You would want to ensure that the stain was the same in both samples.
Answer:Most elements on the periodic table are metals. Looking at the periodic table shows that most elements are metallic.
Explanation: Sorry if this want what you were looking for
Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.