I see no harm in publicly putting info out there. This stuff is not exactly a secret. I also see no problem with you doing what you need to with your Firearm.
I learned this stuff from the internet also. So no Big secrets are going to be revealed anyway.
For Brass try vinegar and salt solution soak. Regular cold blue soaks will patina brass also. They sell patina solutions for Brass all over the internet also. But of course only natural age can produce the real thing. Fake Patina is easily spotted over artificial. So no one will be fooled if they know what to look for,
For Browning the steel and even pitting it a little you can use plain Clorox Bleach. I have used this method to completely Brown barrels instead of buying Browning solution.
You heat the steel with a propane torch just hot enough for the clorox from a spray bottle to sizzle. Let cool, rinse with cold water and card lightly with fine steel wool (preferably the oil boiled from the steel wool first),between application and repeat as many times as you wish to get the desired look. Keep oil off the part too. It takes some time and work. But if done properly, great results can be obtained. Let the Clorox on longer before the rinse will even pit the surface if desired. I mean Hours longer, not minutes.
Again. I see no problem with posting this to help the guy.. Not a issue at all. Paranoia runs deep with some here. If someone buys a collector Firearm with repro parts, artificially aged, or naturally over time. They are obviously are out of their realm to make that purchase anyway, and need to take the time to gain the knowledge required for collector type purchases.
Knowledge is your best friend in these cases.