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Flux is a soldering compound that keeps the soldering joints clean by blocking oxygen, which causes oxidation. Flux cleans, coats, and protects the piece and enables the solder to flow easily between the joints when heated.

Coating Flux

After pickling the item, coat/dip it first in a boric acid flux that protects the entire piece from oxidation and firescale (heavy oxidation that forms on the jewelry from copper in the metal). Firescale is very difficult to remove.

Boric acid flux is 60% boric acid and 40% denatured alcohol and it yields an excellent and inexpensive flux. Add the boric acid to the alcohol until it stops dissolving and forms a thin paste forms. Dip the entire item into the solution, then dry it with gentle heat from the torch; do this three or four times before soldering. Boric acid and denatured alcohol can both be found at a grocery store.

Flow Flux

Now, you need a flux at the solder joint to assist with melting the solder without oxidation. This is called the flow flux. Batterns and Handy Flux are the top choices. Boric acid and water is also used.

  • Batterns Self-Pickling Flux is used for hard soldering (solder that melts at a high temperature) of gold, silver, and platinum. It can be diluted with distilled water if it is too thick. Don’t be fooled by the name, you will still need to pickle the item before soldering. It is available from Amazon in 1, 3, 8, 16, and 128 oz jars.
batternsflux

Batterns Flux

  • Handy Flux is used for easy and medium soldering (solder that melts at a lower temperature) of gold and silver. It can be diluted with distilled water if it is too thick. It’s available from Amazon in 7 oz, 1/2 lb., and 1 lb. jars.
handy flux

Handy Flux

  • Borax and water is a flow flux used by jewelers for years. It’s cheap, but is leaves a glassy coating on jewelry that’s tough to remove. You can purchase borax in the detergent aisle at the grocery store.

Use enough flux to protect the joints from oxidation, but not too much that it prevents the solder from flowing. Flux will bubble when the torch first touches it, and too much flux will really create a lot of bubbles. The bubbling may cause your solder piece to shift, so preheat the flux a bit and then add the solder piece.

Flux dries out easily. Keep enough flux in a small vial to complete the job. Store the rest of the flux in an air tight container.

Jewelry Pickle Pot Kit Recommendations

Photo Name Top Reviews on Amazon
Harris SSWF1/4 Stay Silv Brazing Flux

"This is the only flux I use for silver soldering. Before using this, I could never get the solder to stick. I had tried several other fluxes thinking flux is flux. Clearly I was wrong. You have to use the proper flux for the type of solder and the type of metals you are working with. This is made for high sterling silver content solder, and for that purpose it works great. Always be sure to read the label on your silver and your flux to be sure you’ve got compatible products. Other than that if you start with really clean metal, apply a generous coat of flux, and use the right solder, the rest is just practice to know when you have the part hot enough without overheating. Not enough heat the solder won’t melt. Too much and it will run off without “sticking” to the joint. This flux made all the difference for me. Went from never being able to get the solder to flow into the joint and stick, to having success 99% of the time.read more

Aquiflux Self Pickling Flux for Precious Metals

"This product is absolutely fantastic! I did a light mist over the sterling silver jelwery piece i am making before soldering my next jump ring. Aquiflux helped keep the piece from turning black from the heat and after a quick dip in distilled water to cool it even the jump ring I was soldering did not need to soak in the pickle to get clean. Great time saving product!!read more

LA-CO 22101 Regular Soldering Flux Paste

"I am torch soldering copper jewelry with safety silv 45, I tried two types of fluxes before I found this one, one was 10+ years old and no good, the other was extremely overpriced from the jewelry making section of a craft store and gave the same results. I thought I was doing something wrong, until I tried this one. This works perfectly, and I can't believe how cheap it is. I was shocked that it worked, because I read somewhere on here that it wasn't for silver, but it worked just fine with my silver solder on copper. It makes the metal flow right into place. Be sure to wash it off of any copper it comes into contact with when you are done. I made the mistake of getting it on one of my copper bracelets as I was working and didn't notice untill hours later, now it needs a good cleaning and polishing" read more

STA-BRITE SBSK Silver Solder

"I just recently started working with a solder iron to use on my jewelry, but so far it is pretty easy and this solder and flux is working very well. I am working with silver, silver plate and some base metals and this works great on all of them. I seem to be going through the solder fairly quick so I'll have to order some more soon, but I was surprised at how easy it is. I was so afraid to try this and finally had a friend give me a few pointers and now I'm confident enough to keep experimenting. This particular solder seems more suited toward jewelry making and it looks nice and shiny when I'm done fiddling with it. Some solder is dull, but this one looks much nicer, kind of like real silver. It's also easy to reheat and move around if it comes out a bit too bumpy the first time you apply it. As I get better, I'll post some images of my jewelry." read more

Harris SSBF1 Stay Silv Brazing Flux

"I read about StaySilv and that it was supposed to be a superior flux. I finally bought it and can attest that it's awesome flux for soldering sterling silver! It doesn't take much and the solder flows fast, easy, and clean. Be aware that it is a very dark brown color and there's a bit of an adjustment because it can be difficult to see through it, but once you get used to it it's easy to see the stages as it heats up and when the solder will flow. It's a creamy sort of texture vs. the somewhat crystallized texture of HandiFlux and doesn't dry out like HandiFlux. I'm so glad I made the change!read more

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