G'day Steve and all those who have followed this thread. It's an old thread now but I've only just found the time to pass on some more information that a few of you may find of interest.
Another old book in my library is one entitled, "Fortunes in Formulas", first published pre 1910. My copy is the 13th printing, January, 1946.
Now I don't expect many (any) of you to follow these directions, but, I quote;
"TO CLEAN ARTICLES OF NICKEL;
Lay them for a few seconds in alcohol containing 2% of sulphuric acid; remove, wash in running water, rinse in alcohol, and rub dry with a linen cloth. This process gives a brilliant polish and is especially useful with plated articles on the plating of which the usual polishing materials act very destructively. The yellowest and brownest nickeled articles are restored to pristine brilliancy by leaving them in the alcohol and acid for 15 seconds. Five seconds suffice ordinarily."
And also,
"TO CLEANSE NICKEL,
Fifty parts of rectified alcohol; one part of sulphuric acid; one part of nitric acid. Plunge the piece in the bath for 10 to 15 seconds, rinse it off in cold water, and dip it next into rectified alcohol. Dry with a fine linen rag or with sawdust."
The alcohol referred to is ethyl, grain or ethanol. Rectification means to purify by repeated distillation. I am no chemist so I can't elaborate.
Maybe methylated spirits is a possibility.
Now, I know we don't want to clean our guns this way so don't tell me this is impractical; I know that, but one of you may find it of interest.
Frank S.
SWCA 2052.