Hello everyone I have just spent a day trying to achieve a deep red
patina on copper using one of Hughes and Rowes boiling recipes that
worked well for me a long time ago.
John E. Traister in his book Professional Care and Finishing of Gun
1/2 ounce of sulfurated potassium (liver of sulfur)
3/4 ounce of sodium hydroxide (lye)
32 ounces of distilled water.
Heat the solution (but not to boiling temperature) and dip the
object in it. When the preferred color is attained, rinse in tap
water, dry, and lacquer. (Color will vary from red to bronze to brown,
I’m not sure in which order.)
I’ve not tried this. But looks like a cheap smelly alternative.