These are concoctions of mild acids and other chemicals that dramatically age the copper in a short time usually a day or two once applied.
How to age copper brown. Check any electroplating manual. This is a very simple problemChemicals are readily available to color copper brown or black. If brown is what your looking for Id go with this stuff.
They can be applied before or after a copper roof is installed and depending on the skill and experience of the applicator they can immediately replicate the appearance of a copper roof with decades and decades of exposure. A solution of vinegar and salt or rapid fixer quickly ages copper and it is safe to use at home. The sulfides in the hard-boiled eggs react with the copper to give it a brown appearance but it may take several days to work.
The hexadecimal RGB code of Copper color is B87333. Looking for advice on how to age new copper gutters and copper gutter helmet to a silveresh gray patina finish. Soak copper in a solution of water and rapid fixer to age the metal.
Liver of sulfur will darken copper to black. This code is composed of a hexadecimal B8 red 184256 a 73 green 115256 and a 33 blue component 51256. Look up Reactive Metals and order a small bottle of Baldwins Patina.
The decimal RGB color code is rgb 18411551. Remove object and bristle-brush under hot water. It may be quite difficult to tell the difference between them only by their appearance as clean brass has shiny and golden-brown color whilst copper is more like pink-brown or brown and the bronze is of dark-brown color.
Or for a blue-green patina soak it in a mixture of water vinegar and salt. Use a small brush to paint vinegar or a strong salt water solution 1 to 2 tablespoons or more salt per cup of water on the surface which you desire to age. Darken copper with brown patina.

