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Thread: Hot Bluing
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17th Apr 2017, 11:58 PM #16Golden Member
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18th Apr 2017, 01:57 AM #17Golden Member
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Hi Bill, at that temperature it's simmering, with all the salts dissolved in the solution it doesn't "bump" like boiling water does at 100°C but it does spit small droplets around where it's being heated and release tiny caustic particles into the air that sting when they settle on skin, it's a well ventilated, covered skin and goggles affair
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18th Apr 2017, 04:30 PM #18
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24th Apr 2017, 08:12 PM #19
This would be a good way to make shop made tooling last longer .And look better .
Michael
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18th May 2017, 07:48 PM #20
I finally got some Potassium Nitrate yesterday. It was a special order and I had to leave my ful name, address, phone and license number to get it.
Seems nobody bothers to stock it anymore because of these requirements.
I won't have a chance to try and blue anything for a week or so, but will post the results here when I do.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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18th May 2017, 08:39 PM #21Golden Member
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I look forward to seeing your results Joe, it's pretty pathetic what you had to go through just to get it, lets hope counter terrorism don't swoop your house over a bag of potassium nitrate lol
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18th May 2017, 10:05 PM #22Golden Member
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Potassium Nitrate
I've tried too and anywhere I go they just say "No cannot get it any more - people were doing scary things with it"
When I was a kid we could get Kwikcure from the local supermarket which was then used to cure meat and was pottassium nitrate
This mob might be worth a try - am off on holidays and will try when I get back.
kno3 potassium nitrate australia
Bill
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18th May 2017, 11:08 PM #23Golden Member
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15 bucks a kilo, ouch... How much did you end up paying for a bag Joe?
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19th May 2017, 02:43 AM #24
I paid $71.40 for 25kg.
Happy to share, if someone else wants a couple of kg ($3 a kg + postage).Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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22nd May 2017, 12:56 PM #25Golden Member
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Yes they are talking about ammonium nitrate as a fertilizer however potassium nitrate is even more dangerous .
You want Sodium Nitrate not Ammonium or Potassium nitrate .The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
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22nd May 2017, 01:05 PM #26Golden Member
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How is a Potassium ion "even more dangerous" than a sodium ion? what is your measure of danger?
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22nd May 2017, 02:31 PM #27Golden Member
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Potassium nitrate is a better oxidiser if it gets heated up by a fire . On it's own it's not so bad . It is used in explosives and some rocket fuels so it is very dangerous if it gets going in a fire .
The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
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22nd May 2017, 11:03 PM #28
All three are just fertilisers and meat tenderisers.
Nothing dangerous about them at all - until you deliberately mix them with a fuel which they can oxydise. The mixtures and methods are not trivial and require research or reasonable chemistry knowledge. It is no more complex to make explosives or rocket fuel by many other means without resorting to fertiliser.....
But these were easier to control (than, say, pool chlorine.....)Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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23rd May 2017, 09:25 AM #29.
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Hey Joe,
I'll put my hand up for a couple of kilos if it's still available.
Bob.
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23rd May 2017, 11:21 AM #30Golden Member
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Anyway it's not Potassium nitrate you need in a bluing formula it's Sodium nitrate . To get the blotchy affect out you may need to degrease the metal before bluing it.
The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
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