Copper can turn greenish-White if left /encouraged to oxidize. Otherwise you have to paint it.
sorry I wrote wrongly how can I make the copper get white by any salt or acit? I have some tests on the copper for example when I use amonium salt it becomes a little white.
There is no such element as "white copper".
To change blue copper sulfate to white copper sulfate, you can heat the blue copper sulfate to drive off the water molecules and get anhydrous white copper sulfate. This process is known as dehydration. Be cautious when heating copper sulfate as it can release toxic fumes.
Water changes blue anhydrous copper sulphate crystals to white by creating hydrated copper sulphate, which is white in color.
Having worked in Jewelry factories..the main component metal is copper of which silver is plated onto it. Other metals are white metal or brass. Sometimes nickel. Nickel silver is plated on white metal and gold plate on brass or copper mixed alloys.
Hydrated copper sulphate (CuSO4.5H2O) is BLUE Anhydrous copper sulphate (CuSO4) is white at any temperature.
White copper sulfate is anhydrous, meaning it does not contain water molecules. When water is added to white copper sulfate, it forms a hydrate compound called blue copper sulfate pentahydrate. The water molecules coordinate with the copper ions, causing the compound to change color from white to blue.
Copper iodide (CuI) is a white to pale-yellow solid.
When water and white copper sulfate mix together, the copper sulfate will dissolve in the water, resulting in a blue solution. This is because copper sulfate is a water-soluble compound.
copper is an element, you cant make copper
how you make blue fireworks is by using copper and to make yellow is sodium and to make white is to use magnesium and to make orange you use calcium salts and to gold you use charcoal and to make red you use lithium salts and also to make purple you can you lithium salts (red) and copper (blue).
Copper sulfate is not black. Combined with water, as hydrated copper sulfate, it is blue. Without water, as anhydrous copper sulfate, it is white.