Well, the SS liner of my travel cup...
by Hoot 
, Diversityville, Liberal-sota, Tuesday, September 01, 2015, 09:49 (3311 days ago) @ stonewalrus
is tinged 'golden' from a couple of years of transporting coffee. Maybe a cheap way out? 
A quick 'net search indicates other chemicals are capable, with muriatic acid showing up frequently. Other than the coffee cup, I have no first hand experience.
Complete thread:
- Coloring ("bluing") stainless steel? -
stonewalrus,
2015-08-31, 05:30
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- Can't be blued, however... -
Byron,
2015-08-31, 11:03
- Can't be blued, however... - rob, 2015-09-05, 08:58
- Just ding it with a set punch. nm - Rob Leahy, 2015-08-31, 11:58
- Cerakote. -
mcassill,
2015-08-31, 15:09
- +1. - MR, 2015-08-31, 16:28
- Coloring ("bluing") stainless steel? - Warhawk, 2015-08-31, 16:08
- Well, the SS liner of my travel cup... - Hoot, 2015-09-01, 09:49
- I have had two .22lr cylinder for a Earl and a .1.5" .22,mg -
Rob Leahy,
2015-09-01, 10:07
- Right now I have a LOT more 22 LR than I do 22 mag ammo -
stonewalrus,
2015-09-01, 11:50
- Do you really think you'll shoot more than a box through it -
Rob Leahy,
2015-09-01, 13:56
- Better than a sharp stick - very loud noisemaker -
stonewalrus,
2015-09-01, 14:06
- not THAT much better than a sharp stick;-) I have actaully -
Rob Leahy,
2015-09-01, 23:50
- but it is a 22 MAGNUM... Seriously, I rarely carry it, more - stonewalrus, 2015-09-02, 10:45
- not THAT much better than a sharp stick;-) I have actaully -
Rob Leahy,
2015-09-01, 23:50
- Thank you, Rob... - Byron, 2015-09-01, 17:50
- Better than a sharp stick - very loud noisemaker -
stonewalrus,
2015-09-01, 14:06
- Do you really think you'll shoot more than a box through it -
Rob Leahy,
2015-09-01, 13:56
- Right now I have a LOT more 22 LR than I do 22 mag ammo -
stonewalrus,
2015-09-01, 11:50
- Fingernail polish -- a drop'll do it on the cylinder.... - John Meeker, 2015-09-03, 10:52
- Can't be blued, however... -
Byron,
2015-08-31, 11:03