Silver solder resist

[John Billard 1Participant @johnbillard1]

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

John B

[John Billard 1Participant @johnbillard1]

[Dave Smith 14Participant @davesmith14]

Yes.

[JAParticipant @ja]

Yes, yes. It works. If you have doubts use more than one coat.

After Dave's reply.

JA

[JasonBModerator @jasonb]

Best if it is the solvent based one.

[Bo’sunParticipant @bosun58570]

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

[BazParticipant @baz89810]

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

[CirclipParticipant @circlip]

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

Regards Ian.

[Massimo DalmonteParticipant @massimodalmonte45801]

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

Best regards,

Massimo

[JasonBModerator @jasonb]

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

[CirclipParticipant @circlip]

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.

[BazParticipant @baz89810]

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 1Participant @johnfletcher1]

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 PhinnParticipant @billphinn90025]

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 pgkParticipant @pgkpgk17461]

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

[SillyOldDufferModerator @sillyoldduffer]

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 1Participant @steveskelton1]

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 MemberParticipant @formermember37818]

[This posting has been removed]

[Neil WyattModerator @neilwyatt]

Chalk and charcoal ground up with a little bit of meths will make usable plumbers black.

Neil

[Dave WoottonParticipant @davewootton]

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 1Participant @johnfletcher1]

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

[John Billard 1Participant @johnbillard1]

Just to report that I have used jeweller's rouge and it worked well.

The job was to solder in the backhead bushes for the gauge frame x 2. I made a jig to hold them square from some steel strip. The resist stopped successfully these from being soldered.

Thank you Massimo and all others who contributed.

John B

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