When I stick some Copper (II) Sulfate * Pentahyrate into the blue flame of my butane torch, it turns green. When I crush the tiny CuSO4 crystals up into a finer powder and mix them with a mixture of KClO3 and Sugar, then light that on fire, I get a very blue flame. What is happening here? I thought that copper [+2] ions were suppose to color flames blue? How is it that the same substance is giving off two difference colors? The only exaplanation I could fine for this is, So if this is true, then that would explain it I suppose, assuming CuO produces a blue flame. Except, wouldnt the CuSO4 decompose just as easily in the butane torch flame? If I stick some of the power into the flame and leave it there, watching it, the color should change as it decomposes, but I just dont see that happening.