Copper "Trees" on Aluminum
This is an example of copper growing on a small particle of aluminum that was added to a dilute solution of copper
Darkfield Reflected Light Illumination
Copper trees will grow rapidly on a small grain of aluminum in a slightly acidic solution
containing copper. Copper will plate the aluminum if only very low levels of copper are present.
Significance in the Environment:
The reddish color of the copper stands out in sharp contrast to the white of the aluminum. Even in low concentrations the copper plating out
on the aluminum will be easily visible.