Electrolytic copper powder is purple, very pure
General copper powder is red or light yellow, which contains zinc, silver and other impurities

Copper electrolytic purification: the coarse copper (99% copper) pre-made into a thick plate as an anode, made of copper as a cathode to sulfuric acid (H2SO4) and copper sulfate (CuSO4) mixture as the electrolyte. After the power, copper from the anode dissolved into copper ions (Cu) to the cathode to move to the cathode after the electrons in the cathode precipitation of pure copper (also known as electrolytic copper). Impurities such as copper and copper, such as copper, are dissolved together with copper as ions (Zn and Fe). Since these ions are less likely to precipitate than copper ions, it is possible to prevent these ions from precipitating on the anode as long as the potential difference is appropriately adjusted. Excessive impurities such as gold and silver are deposited on the bottom of the electrolytic cell. This production of copper, known as "electrolytic copper", high quality, can be used to make electrical products.

Pure copper powder preparation process is generally based on electrolytic copper as raw material, melting after the use of atomization method, spherical powder, particle size in the tens to hundreds of microns, and electrolytic copper almost, but the shape of spherical, if used as paint Words, spherical copper powder should be better.

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