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Marking out

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Crocadillopig22/06/2009 11:55:17
30 forum posts
4 photos
Hi All
Back in the sixties we used Marking Blue and Copper Sulphate, the latter was far superior for fine work, etching the workpiece with a light brown patina and didn't wear away with the use of coolants. I believe it was made up of copper sulphate crystals and sulphuric acid ! My question is what was its composition and in what ratios ? Also is it available commercially in small quantities, if not where can I obtain the ingredients.
 
Hope someone can help.  Russ 

Edited By Russell Wigley on 22/06/2009 11:57:37

David Clark 122/06/2009 13:09:07
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3357 forum posts
112 photos
10 articles
Hi There
I believe it was copper sulphate solution.
No acid involved.
regards David
 
Circlip22/06/2009 16:38:42
1427 forum posts
Dave, Copper Sulphate (CuSo4) is copper disolved in sulphuric acid. Get some battery acid Russ and chuck some bits of copper into it (Scrap preferably) and leave until no more will disolve in it. Solution will be a green colour (Like Kryptonite) ALTERNATIVELY you could use the remaints of a pickle bath if you said "Damn the Elfins" and used battery acid let down to a reasonable level and dunked yer copper boilers in it after silver soldering them ORRRRR, the REALLY whimpy way, by getting some Copper Sulphate crystals from the Chemist (Yer gonna have to tell him what yer want them for) and mixing with diluted H2O (Water). Oh aye, trade name was "Killed Spirits" and we also used it as flux for NON electrical soldering, -----  Tinplate days.
 
   Regards  Ian.

Edited By Circlip on 22/06/2009 16:39:43

David Clark 122/06/2009 17:04:18
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3357 forum posts
112 photos
10 articles
Hi There
That is why I got it wrong.
I just bought the crystals.
regards David
Circlip22/06/2009 17:21:26
1427 forum posts
Eeeeeeeeeeeee, that nobut a bairn David lad but we'll turn thee into an Ingineer yet
   Regards  Ian. 
HasBean22/06/2009 17:50:59
141 forum posts
32 photos
Ahh yes, killed spirits.
My grandfather was a plumber and used to buy hydrochloric acid in carbouys. My job on a Saturday as a 7 year old was to sit in front of a bucket of HCL with a pair of tinsnips and a sheet of zinc making the stuff!
Every now and then he'd pass by with a lighter and ignite the hydrogen!
I think Mr Elfin Safety might frown upon this these days. 
Circlip23/06/2009 11:05:53
1427 forum posts
Oooops Eretta, could have been "Spirits of Salts" ---- All Zimmers.
 
   Regards  Ian.
Frank Shaw23/06/2009 14:53:46
1 forum posts
hi guys, check out "Copper Sulphate" on Ebay.
there are several suppliers of quick dissolve crystal there.
this could be what you are looking for.
 
Rgds
Frank
Chris10/07/2009 22:50:31
87 forum posts
13 photos
Just a beginner but if you spray sheet sheel with cheap primer, grey or better white it gives a great surface to draw on with a pencil. try an H2, very fine line and if you cock up you can rub it out. Bought my last tin of light grey from a pound shop for, guess what. Just a quick flash over with the spry can is enough.
Chuck it in some celulose thinners for five minutes and wipe it over with some fine wire wool and hey presto! You might not need to 'cause your going to paint it anyway.
Never tried it with brass but I'll get back to you when I have.
As a newby I just know someone is going to tell me this is a really bad thing to do.
Chris.
Niloch11/07/2009 09:54:35
371 forum posts
Posted by Chris on 10/07/2009 22:50:31:
Just a beginner but if you spray sheet sheel with cheap primer..............

As a newby I just know someone is going to tell me this is a really bad thing to do.
Chris.

 

 Not me Chris, but then I'm a novice too more interested in horology than the heavy stuff.
 
John Parslow, in the very first instalment of his serial on a 15 day Skeleton Timepiece (ME 4322 - 28/03/2008)says:
"Polished plate is supplied with a protective film on both sides.  I suggest stripping off this film and spraying both sides with two or three coats of red oxide primer paint available in an aerosol can from motor accessory shops.  This will protect the surface from accidental marks and scratches and provide an excellent surface for marking out with pencil or scriber". 
 
I've also used blue 'Magic Marker'
WALLACE14/07/2009 17:18:21
304 forum posts
17 photos
Cromwell tools do marking out blue in 500ml bottles which appeared to be most cost effective. I would recomend decanting some into a smaller bottle (plastic !) as it will make an awfull mess if knocked over .  .  
 
WALLACE
Ian S C15/07/2009 11:58:54
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7468 forum posts
230 photos
Hi wallace,an empty nail polish bottle just the thing,brush included!I use felt pen. Ian.s.c.
WALLACE15/07/2009 12:36:48
304 forum posts
17 photos
Thanks for the tip. I'll start saving mine up from now on !
W. 

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