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Silver solder resist

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John Billard 106/12/2021 22:35:35
108 forum posts

Is type correction fluid, e.g. Tippex, the thing for this?

John B

Dave Smith 1406/12/2021 22:57:58
212 forum posts
43 photos

Yes.

JA06/12/2021 23:03:10
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1345 forum posts
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Yes, yes. It works. If you have doubts use more than one coat.

After Dave's reply.

JA

JasonB07/12/2021 06:54:24
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Best if it is the solvent based one.

Bo'sun07/12/2021 08:20:54
602 forum posts
2 photos

Best stock up on it, typewriters are probably a thing of the past.

Baz07/12/2021 08:38:23
713 forum posts
2 photos

+1 for Tippex, a lead pencil also works fairly well.

Circlip07/12/2021 10:10:47
1500 forum posts

Is solvent based Tip-ex still available? Solvent used was Trichlorethane, H and S and all that garbage.

Regards Ian.

Massimo Dalmonte07/12/2021 10:13:13
33 forum posts
18 photos

A "paint" made with jeweller's rouge and water, applied with a brush, works too.

Best regards,

Massimo

JasonB07/12/2021 10:17:24
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Posted by Circlip on 07/12/2021 10:10:47:

Is solvent based Tip-ex still available? Solvent used was Trichlorethane, H and S and all that garbage.

Regards Ian.

Yes but now has a different solvent  here

Edited By JasonB on 07/12/2021 10:20:25

Circlip07/12/2021 10:35:00
1500 forum posts

Thanks for that Jason, seems due to all the precautions stated, Tip-ex shouldn't be exposed to any heat source and Naptha has a slower evaporation rate than Trike.

Regards Ian.

Baz07/12/2021 13:24:16
713 forum posts
2 photos

When I was working we used to use a Nikrobraz stop off pen, very similar to a felt tip pen, it deposited a very light green liquid a bit thinner than Tippex on to the work, we have were using it in a vacuum furnace and it worked perfectly every time. Just need now to find someone who sells the pens in small quantities.

john fletcher 107/12/2021 14:49:04
785 forum posts

Years ago when Men were men, plumbers would wipe a lead pipe and under ground cable jointers would make a live joint, they used "Plumbers Black" as a resist. It came In a Yellow tin, they would dribble, a drop of water on to the black and paint it onto the pipe to make a very neat connection. After the work, the residual would wash off. I live where it was made and sold, and have tried for several years to find out what it composed of. Certainly effective at high temperature and cheap in 1950/60's. I'm sure it would be a good alternative to Tippex and no solvent involved. Does a forum member know what the Black was composed of ? John

Bill Phinn07/12/2021 15:44:25
737 forum posts
103 photos
Posted by Circlip on 07/12/2021 10:35:00:

Thanks for that Jason, seems due to all the precautions stated, Tip-ex shouldn't be exposed to any heat source and Naptha has a slower evaporation rate than Trike.

Regards Ian.

 

I've regularly used Tipp-Ex when soldering. Yes, it emits a green smoke when heated and an unpleasant smell, but I can live with that, or at least I have done so far.

Massimo's suggestion is probably the best one from a safety standpoint. It just requires a bit more work to keep some mixed up and ready for use.

 

Edited By Bill Phinn on 07/12/2021 15:49:33

pgk pgk07/12/2021 15:47:43
2552 forum posts
293 photos

I found this reference via google:

‘plumber’s black’ –

a masking fluid made of size (animal skin glue),

whiting and lamp black mixed together to a

creamy consistency

SillyOldDuffer07/12/2021 16:29:17
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Posted by john fletcher 1 on 07/12/2021 14:49:04:

... when Men were men, ... they used "Plumbers Black" as a resist. ...I live where it was made and sold, and have tried for several years to find out what it composed of. ...

Henley's 20th Century Formulas, Processes and Trade Secrets says:

a protective mass consisting essentially of carbon (graphite, coke or charcoal), powdered talc or asbestos, ferric hydrate (with or without ferrous hydrate) and, if desired a little Aluminium Oxide, together with a a binding agent of the customary kind (glue solution, beer).

Example recipe: Graphite, 50 parts; powdered coke, 5 parts; powdered talc, 5 parts, glue solution, 2.5 parts; drop beer, 2.5 parts; ferric hydrate, 10 parts; aluminium oxide, 5 parts.

By glue, they mean animal glue made from bone and sinew. Drop Beer seems to be low-alcohol beer, less than 0.5%

I could only find Ferric Hydrate - modern name Iron(iii) Hydroxide - sold as a laboratory reagent. £104 for 5g, ouch!

Might be possible to make your own cheaply by mixing garden centre Iron Sulphate with Caustic Soda. I don't suppose it needs to be pure.

Dave

Steve Skelton 107/12/2021 18:39:05
140 forum posts
6 photos

I'm also with Massimo on this one.

Jewellers rouge lasts forever and is easily mixed with a little water and if it goes dry in storage just add a little more water.

Works a treat and is low cost - £4 for 50g (eBay) which will last for a lot of soldering.

Former Member04/01/2022 05:09:41

[This posting has been removed]

Neil Wyatt05/01/2022 15:23:05
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Chalk and charcoal ground up with a little bit of meths will make usable plumbers black.

Neil

Dave Wootton05/01/2022 16:43:08
290 forum posts
65 photos

Recently I couldn't find Tippex brand locally, so tried W H Smiths own solvent brand it works just as well as the genuine article and turns out to be much cheaper too!

Dave

john fletcher 106/01/2022 14:58:26
785 forum posts

Many thanks Dave for the list of ingredients for PLUMBERS BLACK, I'll give it a try and let you know how I get on. In the means time I'll give Jewellers rouge a go. John

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