Mike: I think you're right. Then again, if it was easy, I doubt if Keith Kearcher or Dale Edmonds would be telling us
I do not know Mr Kearcher, but give Dale Edmonds a call at (816)444-2040. The man will tell you everything you want to know about etching damascus. He was working with Oscar to understand the process when Oscar passed. He has continued to grow and develop his own methods.
I have heard the bleach approach, as well as several others. My own experiments tell me that your mileage may vary. Not because the recommended solution is wrong, but because we don't know exactly alloys compose every set of damascus barrels. Some react well, others not as well.
Gordon,
You don't mention the gun. Is this a high end gun? What condition are the barrels in currently as far the damascus finish? Are they etched black & white, browned or blackened?
Pete