Zonie said:
From what I can find, Hydrogen Peroxide is about as acidic as "acid rain".
In other words, it's not acidic enough to make a difference when it comes to cleaning black powder fouling.
Anyone wanting to spend the extra money would be way ahead of the game by buying a gallon of distilled water.
The distilled water will cost less too.
A 10 % solution of pure hydrogen peroxide has a pH of about 5.3, whereas "acid rain" has a pH of
less than 5.6 (normal rain is slightly acidic due to CO2 in the air).
However, some makers add acid to stabilize the peroxide (LeC principle). Some don't, and some use other stabilizing agents that are base. In other words, unless the maker tells you the pH (doubtful), there is no telling what you have unless you measure it !!!
Clyde, I tried to send you some pHydrion paper (I'm out of litmus) - I put it in this slot in my computer, but couldn't get it to "send". And now my floppy drive doesn't seem to work ....???!!! :shocked2:
Anyhoo, one reference I found gave a list of bp residues:
"The principal gases formed are carbon dioxide, carbon monoxide, and nitrogen. About one third of the gas created is nitrogen. The solid products are potassium carbonate, potassium sulfate, and potassium mono- and higher sulfides, and carbon. The white smoke and fouling of blackpowder comprise the solids that are produced upon combustion. In one test, 82 grains by weight left 42 grains of solid residue. The sulfides in the emissions create the nostril flaring rotten egg smell we all disdain."
As I said then, this list of solids should be mostly basic. No mention of sulfurous or sulfuric acid being formed, but hydrogen sulfide is formed during the reaction, which could react with oxygen to form SO2 and water to make acid. As I said then, I plan on testing the pH of my first wash (using distilled water) to find out for sure (haven't been back to the range since then).
If the residue is basic, you could use a weak acid (acetic, ie vinegar) to neutralize it, but you could also just use water to dissolve the potassium salts (all of which are very water soluble - even more so in warm water).
Just don't let it sit in the barrel, especially the first wash!
Remember that dilution of an acid or a base is a "neutralization" technique, too.
I may try to have the first wash analyzed for anions. Then we will know for sure what we have (and a better idea of how to deal with it).
On the other hand, if YOUR method is working for YOU, "... don't "fix" it" !!! :v
I will probably continue to use hot (tap) water with a cap of Murphy's regardless of what I find. Seems to work for MY conditions.
(Sorry for all the chemistry, folks.)