Copy chrome is basically a substitute for the nickel in the triple chrome process, with no chrome third step.
So, the only difference between the two is with copy chrome it's no longer a triple step process. It's a 2 step process. Frankly, since there is no real prep work involved between the nickel and the chrome step, it's really just time in the chrome tank and having enough rectifier current to get the job done right.
Don't overlook that third point. It can be a real engineering challenge with large parts.
Also, I applaud you for considering the environmental concerns. Hexavalent chromium is a known carcinogen. The chromic acid fumes are not good for your health. However, on a very small scale (eg perhaps a few gallons at most) these things can be controlled with great care. But don't think it's easy. For example, if an accidental spill were to occur, would you be tempted to just mop it up and rinse the mop out in the sink? Or would you contain the wastewater and properly dispose of it? You have to be very disciplined about it. Most people aren't. That's why the EPA is so strict.
Ken
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