Restoring dried solder flux paste

[ubuntuwi]

The tacky flux in syringes contain petroleum jelly as well. Unfortunately the fraction of it is a secret. I think a third of the weight can not be bad. So you have 1 part rosin, 1part IPA or other alcohol and 1 part petroleum jelly.

I think it's a recipe like:
55% petroleum jelly
40% rosin
5% alcohol
because Vaseline is a rosin thinner ... 
(Hi I'm new to the forum, I would like to participate)

[SilverSolder]

The tacky flux in syringes contain petroleum jelly as well. Unfortunately the fraction of it is a secret. I think a third of the weight can not be bad. So you have 1 part rosin, 1part IPA or other alcohol and 1 part petroleum jelly.

I think it's a recipe like:
55% petroleum jelly
40% rosin
5% alcohol
because Vaseline is a rosin thinner ... 
(Hi I'm new to the forum, I would like to participate)

Welcome to the flux party, @Ubuntuwi

Have you tried making the recipe you suggested?

[ubuntuwi]

SilverSolder
yes, I tried to make the recipe that I suggested!: in a few days I will publish some tricks, which I learned immediately, in the meantime I tell you: you have to mix the rosin powder with vaseline, (cold), then using a stove electric, put everything in an earthenware pot, bring the temperature to 130 ° celsius, (everything melts) mix with a piece of wood; always turn ... when you see that the rosin wants to separate from the petroleum jelly ... spray the alcohol, isopropilic. (at this point the temperature should be around 80 ° celsius, and hot alcohol is soluble with rosin, but also with petroleum jelly, all this giving an inseparable mixture). continue to mix until cool.

[netsecrets00]

ubuntuwi waiting for your tricks

[englishrupe01]

ubuntuwi waiting for your tricks

Yep, me too, please, Ubuntwi.....tell us your tricks?

[Trurl]

... avoid 'violin rosin' as it may have additives undesirable in flux.  If the country isn't 'dry' you can probably also get 95% pure ethanol, though you may have to settle for denatured alcohol.   Provided you let the mixed flux settle out and decant it to remove undissolved solids, detritus that was embedded in the rosin, and any aqueous layer, the resulting liquid flux is comparable to commercial ROL0 (unactivated rosin 'R') flux.

I have some approximately 30 year old D'Addario Rosin DARK (for violin bow I used on a Korean gayagum zither), 95% ethanol, and "fancy" Vaseline brand "petrolatum", so for a moment I considered the possibility of  making my own "brew".  But considering this rosin's ingredients: American Gum Rosin, Natural Beeswax, Castor Bean Oil, Tar and also the confession by someone that has made something that works such as jpanhalt that he, "would never consider making, rather than buying a flux" I've decided to face practical reality, and just order some Chip Quick SMD291.

Thank ya'll for this crazy ride. I'm sufficiently "de-ignorantized" about soldering paste. Cheers~

[helius]

Tar would be an undesirable additive, because of its tendency to stick tenaciously to surfaces, which would impair cleaning. Along with the castor oil, its function in violin rosin would seem to be to prevent flaking off when the bow is used.
The smell of hot tar would be impressive, however.