A homogeneous substance is made up of the same material. So what if you made your device out of different materials? What would be the effect of each part? How would these interact? What if you used all the same material?
A. Make objects interacting with a given object of the same material (or material with identical properties).
Make the container out of the same material as the contents, to reduce chemical reactions.
- Make a diamond cutting tool out of diamonds.