I don't use T-grade by itself. I just use it as an additive now.
Even though I kind of freaked out when I first saw it, I really thought the ferric nitrate idea was on point. Before you do anything with ferric nitrate, however, read this first. It's the MSDS for ferric nitrate, and will give you an idea of what you can expect. Take it seriously, please.
I looked around to see if turpentine is reactive with ferric nitrate, and apparently, they use the two together for patina work- I wasn't clear on whether there's any actual mixing of the two involved, so be warned.
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besides using that toxic ass shit is there anything else? unlike other people on this board i dont wanna fuck around with shit like that when im not 100% sure what im doing.