Doesn't even rise to POTD, maybe POTH, but here goes.
Tried rust bluing this afternoon. Made up a solution of 1/4 cup of 12% hydrogen peroxide into 1/4 cup of filtered warm water and added a tablespoon of table salt to it. Mixed it up in a little disposable kitchen container. Threw in the 6 tee-nuts I had made for my rotary table. I had previously soaked the tee-nuts in hot water and dish detergent overnight. Actually renewed the water and detergent 3 times to try to get rid of any oil. Solution started bubbling and turning rusty. After a couple of minutes, I took out the tee-nuts and stuck them on a sheet of scrap cardboard. Then using a hot air gun, dried off the solution. More rust. Kind of weird considering that all my life I have been trying to avoid it. Now I was trying to get things rusty.
Using a old toothbrush, lightly brushed off any loose rust. Then tossed the "carded" tee-nuts into a pot of boiling water. Left it in the boiling water for 5 minutes. Well, the magic of better living through chemistry happened, and that orange stuff turned dark black. The first time through was a little splotchy, and a bit disappointing, but the process needs to be repeated. I repeated 3 more times. On the fourth time, there was no reaction, my solution was spent. Mixed up another, and wow, pretty vigorous again. Boiled the tee-nuts again and pulled them out. Have to say, for less than an hours worth of work, they came out pretty good, much better than I expected. Won't win the best blue in show, but perfectly nice for my rotary table.
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I think the bluing isn't that good in the threads, maybe due to residual oil, but overall, have to say I like this. Next time, I'll probably boil the parts in TSP first. I didn't' want to do that with our kitchen pots. Have to find a cheap pot somewhere.