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Legal requirement, I am pretty sure that if you are keeping somebody's gun overnight to work on, you must have a FFL.
Brownells sells a down the drain disposal kit for bluing solution. It is built on sulfamic acid, hot bluing salts contain sodium hydroxide and are strongly alkaline.
You can still get Dulite bluing, used in WWII before Parkerizing became universal.
Depending on your level of involvement and interest, you can make your own.
My FLG said he was glad he lost his bottle of 19th century rust bluing solution in a move. It gave great bluing at the cost of a lot of work.
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